Back (VC and SC) Flashcards
1
Q
How long is the adult vertebral column?
A
72-75 inches
2
Q
What does the back consist of?
A
Posterior Trunk, SC, VC
3
Q
True/False: The back is the region to which the neck, head, and limbs are attached.
A
True
4
Q
What six things does the back include?
A
- skin and subcutaneous tissue 2. Muscles 3. VC (w/ associated structures) 4. Ribs 5. SC and meninges 6. Segmental nerves and vessels
5
Q
What protects the SC and nerves?
A
Vertebral Column
6
Q
What are the other three major functions of the VC?
A
Support weight, provide axis, and posture & locomotion
7
Q
How many vertebrae are there in total?
A
33
8
Q
How many cervical vertebrae are there?
A
7
9
Q
How many thoracic vertebrae are there?
A
12
10
Q
How many lumbar vertebrae are there?
A
5
11
Q
How many sacral vertebrae are there?
A
5
12
Q
How many coccygeal vertebrae are there?
A
4
13
Q
What are the sacral vertebrae fused to form?
A
Sacrum
14
Q
What are the coccygeal vertebrae fused to form?
A
Coccyx
15
Q
At what age does fusing of the coccygeal vertebrae occur?
A
approx after age 30
16
Q
What is it called when L5 abnormally fuses to the sacrum?
A
Sacralization
17
Q
What is it called when S1 is not fused to the sacrum, but instead the Lumbar vertebrae?
A
Lumbarization
18
Q
What type of joints primarily make up the VC?
A
Synovial Zygapophysial (facet) joints
19
Q
What do the zygapophysial joints function to do?
A
Facilitate and control flexibility
20
Q
What three components make up a typical vertebra?
A
Body, Arch, and 7 processes
21
Q
Name three characteristics of the vertebral body.
A
More massive, cylindrical anterior part. Size increases as VC decends, and it is primarily made of spongy bone enclosed by a thing external layer of compact bone
22
Q
What is most the vertebral body covered in?
A
Discs of Hyaline cartilage
23
Q
What are the two parts of the vertebral arch?
A
Two pedicles and laminae
24
Q
What is formed between the arch and the body?
A
Vertical Foramen
25
What structure is indicated by an indentation in lateral views above and below the pedicles?
Vertical Notch
26
What are the three types of processes found on a vertebrae?
Spinous, Tranverse, and Articular
27
How many spinous processes are on a given vertebrae?
one
28
How many transverse processes are on a given vertebrae?
Two, one on each side from junction pedicle and laminae
29
How many articular processes are on a given vertebrae?
four, two superior and two inferior
30
What structure does each articular process bear on?
Articular surface (facet)
31
What structure provides the attachment for epaxial muscles and serves as levers?
The Vertebral Arch
32
What type of vertebrae is formed of the skeleton of the neck?
Cervical
33
What structure is present in cervical vertebrae in the transverse processes?
Foramen Transversarium
34
What is the name of the C1 vertebrae?
Atlas
35
What is the name of the C2 vertebrae?
Axis
36
Vertebral arteries pass through all cervical vertebrae except for which one?
c7, only small accessory veins
37
Where on the cervical vertebrae do the anterior ramus of nerves course?
Grooves on the transverse processes between the tubercles
38
What paired structure is specific to the atlas to which the transverse processes arise from?
Lateral masses
39
What special structure does the axis have that allows promotes better articulation?
Dens of axis
40
T/F: The dens of axis is a tubercle.
False. it is a protuberance (projection)
41
What type of vertebrae provide the attachment for the ribs?
Thoracic
42
What special type of facets do thoracic vertebrae have?
Costal facets
43
What is unique about the shape of the spinous processes on thoracic vertebrae?
Extra long and thick *spiky*
44
What type(s) of movements do the thoracic vertebrae allow?
Rotation and some Lateral Flexion
45
What type of movement do the cervical vertebrae allow?
Flexion, Extension, LFlexion, Rotation
46
True/False: T7-12 are missing the costal facets restricting movement to only flexion and extension.
True
47
Describe the rule of "threes" for spinous processes of thoracic vertebrae.
T1-T3 are at the same level. T4-6 are half a level below. T7-10 are one whole level below. T11 is a half level below. T12 is at the same level.
48
Which vertebrae have massive bodies for weight bearing?
Lumbar vertebrae
49
What type of process is special to lumbar vertebrae?
Mamillary processes
50
What do the the transverse processes allow attachment of?
Intertransversarii muscles
51
What do the mamillary processes allow attachment of?
Multifidus and intertransversarii muscles
52
What is special about the sacral vertebrae?
They are fused
53
What are the two "functions" of the sacrum?
Provides strength and stability to pelvis AND transmits the body weight to pelvic girdle
54
Where does the vertebral canal end?
Approximately L1
55
What is formed beyond L1 containing a bundle of spinal nerve roots?
Cauda Equina
56
What structure special to the posterior sacral vertebrae surfaces provide the exit of rami of spinal nerves.
Sacral Foramina
57
How many pairs of sacral foramina are there?
4
58
Where is the base and apex relative to the sacral/coccygeal vertebrae?
Base - top. Apex - bottom.
59
At what age does fusion of the sacrum begin?
~20
60
In which gender is the sacrum typically wider in/?
Females
61
What structure forms from the absense of laminae and process of L5?
Sacral hiatus
62
What structure represents the inferior articular processes of S5? (projects on each side of sacrum)
Sacral Cornea
63
What forms in the middle of the sacrum starting at the base?
Sacral canal
64
What structures does the coccyx provide attachment for?
Gluteus maximus, coccygeus muscles, anococcygeal ligament
65
When does ossification begin?
Embryonic period
66
From what does ossification begin?
Mesenchymal condensations around notochords
67
What forms next from the mesenchymal bone models?
Cartilaginous Vertebrae
68
When does ossification typically begin?
End of embryonic period (8th week)
69
What are the three primary ossification centers?
Endochondral Centrum and two pericondral centers
70
Which ossification centers constitutes the majority of the VC body?
Endochondral
71
Where are the perichondral centers?
One in each half of the neural arch
72
Typically, at birth what does the VC consist of?
3 bony parts united by hyaline cartilage
73
At what age does fusing of neural arches typically begin and finish?
3,6
74
Where are the five secondary ossification centers that develop during puberty?
1. tip of spinous process 2. tip of each transverse process 3. two annular epiphyses
75
When does secondary ossification usually unite by?
25
76
What can developmental errors result in?
One less or one extra vertebrae
77
What is it called when vertebral foramen narrows?
Lumbar Spinal Stenosis
78
What abnormality can form from C7 transverse process enlarging?
Cervical Rib
79
What is hemisacralization?
L5 fused with sacrum
80
What is it called when epiphyses fail to fuse?
Spina bifida
81
What type of joints are at the vertebral bodies?
Symphyses
82
What two things connect the articulating surfaces of adjacent vertebrae?
IV discs and ligaments
83
How much of the length of VC do IV discs account for?
20-25%
84
What secondary function do IV disks provide?
Shock absorbers
85
Between which two vertebrae is no IV disc present?
c1 and c2
86
What is the gelatinous middle of an IV disk?
Nucleus pulposus
87
What surrounds the nucleus pulposus?
Annulus fibrosus
88
What develops between the unci of the bodies of C3/C4 and C6/C7?
Clefts (unconvertebral joints)
89
Where are these clefts located?
Lateral and posterolateral margins of IV discs
90
What abnormality can develop at these clefts?
Bone spurs
91
What ligament connects and covers the anterolateral aspects of vertebral bodies and IV discs?
Anterior Longitudinal Ligament
92
What motion is prevented because of this ligament?
Hyperextension
93
What movement is limited by all other ligaments?
Flexion
94
What ligament runs within the VC along the posterior vertebral bodies?
Posterior Longitudinal Ligament
95
What benefit does the PLL have for the nucleus pulposis?
Redirects herniation
96
What type of nerve endings innervate the PLL?
Nociceptive (pain)
97
What type of joint are at the vertebral arches between the superior and inferior processes?
Zygapophysial (facet) joints
98
What type of joint are these facet joints?
Plane synovial
99
What movement do these joints permit?
Gliding
100
What rami innervates the facet joints? how many nerves supply each articular branch?
Posterior, 2
101
What ligament joins adjacent laminae?
Ligamenta flava
102
What do ligamenta flava function to provide?
Resist separation of laminae, limit abrupt flexion of VC, preserve the normal curvatures and promote separating
103
What ligaments connect adjoining spinous processes?
Interspinous Ligaments
104
What ligaments connect the tips of spinous processes from C7 to the sacrum?
Supraspinous ligaments
105
What ligament does the supraspinous ligaments merge with?
Nuchal Ligament
106
What is the nuchal ligament?
Thickened fibroelastic tissue extends from exterior occipital protuberance and posterior border of foramen magnum to the spinous processes.
107
What ligament connects adjacent transverse processes?
Intertransverse ligament
108
What are the two craniovertebral joints?
Atlanto-occiptal and atlanto-axial
109
What is the Atlanto-Occipital Joint?
Atlas and occipital bone (condyles)
110
What type of joint is the Atlanto-Occipital Joint?
Synovial condyloid
111
What movements are permitted by the Atlanto-Occipital joint?
Nodding (Flexion/Ext) and Sideways tilting (Lat Flexion)
112
What three articulations are formed by the Atlanto-Axial Joint?
Two lateral gliding synovial and one median pivot joint
113
What movement does the Atlanto-Axial Joint permit?
Rotation (Shaking head no)
114
What ligament is a transverse ligament of the atlas plus the longitudinal bands?
Cruciate Ligament of the atlas
115
What ligament extends from the sides dens of the axis to the lateral margins of the foramen magnum?
Alar ligaments
116
What is a strong continuation of the post-longitudinal ligament that passes posteriorly over the median AA joint and its ligaments?
Tectorial Membrane
117
What six things limit range of movement?
1. thickness, elasticity, and compressibility of IV discs 2. shape and orientation of zygapophysial joints 3. tension of joint capsules of zygapophysial joints 4. Resistance of the back muscles and ligaments 5. attachment to the rib cage 6. bulk of surrounding tissue
118
What are the four curvatures that occur in the spine?
Cervical and lumbar lordosis AND Thoracic and sacral kyphoses
119
What innervates the VC?
Meningeal branches of spinal nerves
120
What other structures are supplied by the meningeal branches?
Periosteum, annuli fibrosi, and ALL
121
What type of sensation is innervated by these meningeal branches?
Pain receptor/ proprioception
122
What effect does aging have on VC?
Nucleus pulposis dries up and annulus fibrosis assumes the share of the lead and leads to stress/strain, IV discs increase in size and become convex
123
What are the five sources of back pain?
Fibroskeletal Structures, Meninges, Synovial Joints, Muscles, Nervous Tissue
124
What is a herniation of an IV disc?
annulus fibrosi ruptures and nucleus pulposis flows out
125
What is it called when two vertebraes are joined by surgery?
Spinal Fusion
126
What is a secondary term for spinal fusion?
Spondylodesis, spondylosyndesis
127
What is osteoarthritis of VC?
breakdown of cartilage of the joints and IV discs
128
True/False: You can't rupture a back ligament.
False, you can.
129
Can you fracture or dislocate vertebrae?
Yes you can
130
What is the name given to excessive thoracic kyphosis?
Humpback/Hunchback
131
What is the name given to excessive lumbar lordosis?
Sway back
132
What is scoliosis?
sideways curvature of the spine
133
What are known as extrinsic muscles?
Superficial and immediate muscles
134
What are the functions of extrinsic muscles?
Control limbs and respiratory movements
135
What are the four superficial back muscles?
Trapezius, Latissimus Dorsi, Levator Scapulae, Rhomboids
136
What do the extrinsic muscles connect?
Axial skeleton w/ appendicular skeleton
137
What is the primary intermediate extrinsic muscle?
Serratus
138
What is the OIAN of the trapezius?
O: external occiptal protuberance, ligamentum nuchae, and spinous process of C7 to T12. I: Posterior border of lateral third of clavicle, acromion process, and spine of scapula. A: Elevation of upper fibers, retraction from the middle fibers, depression from the lower fibers. N: Spinal root of the accessory nerve (CN XI)
139
What is the OIAN of the Latissimus Dorsi?
O: Spinous process of T7-L5, thoracolumbar fascia, illiac crest, inferior ribs 3 and 4 and inferior angle of scapula. I: Medial lip of intertuburcular groove of the humerus. A: Extension, Adduction, Medial Rotation of humerus, elevate the body when climbing. N: Thoracodorsal nerve.
140
What is the OIAN of the Levator Scapulae?
O: Posterior tubercles of transverse process of C1 to C4. I: Superior part of medial border of the scapula. A: Elevates scapula, rotates head to the same side. N: Dorsal Scapular nerve (C4-5)
141
What is the OIAN of the Rhomboid major?
O: Spinous process of T2-5. I: Medial border of scapula. A: retracts and downwardly rotates the scapula. N: Dorsal scapular nerve (C4-5)
142
What is the OIAN of the Rhomboid Minor?
O: Spinous process of C7, T1 and the ligamentum nuchae. I: Medial border of scapula. A: Retracts and downwardly rotates the scapula. N: Dorsal scapular nerve (C4-5)
143
What is the OIAN of the serratus posterior superior?
O: Ligamentum nuchae, spinous process of C7-T3. I: 2-5 Ribs. A: Elevates the 4 superior ribs (to increase the size of thorax). N: Ventral Primary Rami of first 3-4 thoracic nerves
144
What is the OIAN of the serratus posterior inferior?
O: Spinous processes of T11-L2. I: Inferior ribs 3 or 4. A: Depress the inferior 3-4 ribs (to prevent superior pull by the diaphragm). N: Ventral primary rami of last 4 thoracic nerves
145
What are the functions of the intrinsic muscles?
Specifically act on vertebral column, producing its movements, and maintaining posture
146
What are the intrinsic muscles composed of?
Deep fascia that attaches medially to nuchal ligament, tips of vertebrae, supraspinous ligament, and median crest of sacrum
147
What are the intrinsic muscles of the back?
Splenius muscles, Errector Spinae muscles, transversospinalis muscles
148
What are the two splenius muscles?
Splenius capitis, Splenius cervicis
149
What is the OIAN of the Splenius capitis?
O: Nuchal Ligament and spinous processes of c7-T3. I: Mastoid process, occipital bone. A: Rotate the head and neck to the same side, neck/head extension. N: Dorsal primary rami.
150
What is the OIAN of the Splenius cervicis?
O: Spinous processes of T3-6. I: Transverse process of C1-4. A: Rotate the head and neck to the same side, extend head and neck. N: Dorsal primary rami.
151
What are the three errector spinae muscles?
Spinalis, Longissimus, Iliocostalis
152
What is the common innervation of the errector spinae muscles?
Dorsal primary rami.
153
What are the actions of the errector spinae muscles?
Extension, Lateral Flexion, Eccentric contraction as back is flexed
154
What is the origin and insertion of the Iliocostalis Lumborum?
Iliac crest to the angles of the inferior six ribs
155
What is the origin and insertion of the Iliocostalis Thoracis?
6 lower ribs to the six upper ribs
156
What is the origin and insertion of the Iliocostalis Cervicis?
Six upper ribs to the transverse processes of lower cervical vertebrae 4-6
157
What is the origin and insertion of the Longissimus thoracis?
Lower Lumbar spinous processes and sacrum to the lower nine ribs and assoc. transverse processes
158
What is the origin and insertion of the Longissimus cervicis?
Transverse processes of T1-4 or 6 to the transverse processes of C2-6
159
What is the origin and insertion of the Longissimus capitis?
Lower 4 cervical vertebrae to the mastoid process of the temporal bone
160
What is the origin and insertion of the Spinalis?
Spinous processes of T11-L2 to the spinous processes of the upper 4-8 thoracic vertebrae
161
What are the deep intrinsic muscles?
Semispinalis, multifidus, rotatores, interespinales, intertransversarii, levatores lostarum
162
What is the OIAN of the semispinalis?
O: Transverse processes of C4-T12. I: occipital bone and spinous processes in thoracic and cervical regions. A: Head Extension, Head rotation N: Dorsal rami of cervical spinal nerves
163
What is the OIAN of the Multifidus?
O: C2-S4, most prominent in lumbar region, vertebral arches I: spinous processes A: Lateral Flexion, Rotation, trunk extension
164
What is the OIAN of the Rotatores?
O: transverse processes of vertebrae. *most prominent in T region. I: base of the spinous process of superior vertebrae of attachment. A: rotation, proprioceptive role. N: Dorsal rami of spinal nerves
165
What is the OIAN of the Interspinales?
O: Superior surfaces of spinous processes of cervical and lumbar vertebrae. I: Inferior surfaces of spinous processes of vertebra superior to origin/ A: Aid in extension and rotation N: Posterior rami of spinal nerves
166
What is the OIAN of the Intertransversarii?
O: Transverse processes of cervical and lumbar vertebrae. I: Transverse processes of adj vertebrae. A: Aid in Lateral Flexion, stabilization. N: Posterior and anterior rami of spinal nerves.
167
What is the OIAN of the Levatores costarum?
O: Tips of transverse processes of C7 and T1-11 vertebrae. I: Rib between tubercle and angle. A: Elevate ribs, assist with respiration, assist with lateral flexion. N: posteriopr rami of C8-T11 spinal nerves
168
Review: What are the muscles that assist with flexion?
Longus coli, scalene, SCM, rectus abdominus, psoas major
169
Review: What are the muscles that assist with extension?
Semispinalis cervicis, Iliocostalis cervicis, Splenius cervicis, levator scapulae, splenius capitis, multifidus, longissimus capitis, Semispinalis capitis, trapezius, erector spinae, semispinalis thoracis
170
Review: What are the muscles that assist with lateral flexion?
Iliocostalis cervicis/thoracis/lumborum, Longissimus capitis/lumborum/cervicis, Splenius capitis and cervicis, Intertransversarii, scalenes, multfidus, external and internal obliques, quadratus lumborum, rhomboids, serratus anterior
171
Review: What are the muscles that assist with rotation?
Rotatores, semispinalis capitis and cervicis, multifidus, splenius cervicis/thoracis, Iliocostalis, Longissimus
172
What are the suboccipital muscles?
Rectus capitis posterior major, rectus capitis posterior minor, obliquus capitis superior, obliquus capitis inferior.
173
What are the suboccipital muscles innervated by?
Posterior rami of C1, suboccipital nerve
174
What is the origin and insertion of the rectus capitis posterior major?
Spinous process of c2 to lateral part of inferior nuchal line of occipital bone
175
What is the origin and insertion of the rectus capitis posterior minor?
Posterior tubercle of posterior arch of C1 to medial part of inferior nuchal line of occipital bone
176
What is the origin and insertion of the obliquus capitis superior?
Posterior tubercle of posterior arch of C2 to transverse process of C1
177
What is the origin and inseretion of the obliques capitis inferior?
Transverse process of C1 to occipital bone between superior and inferior nuchal lines.
178
What are the muscles that allow flexion of the atlanto-occipital joints?
Longus capitis, Rectus capitis anterior, Anterior fibers of SCM, Suprahyoid and infrahyoid muscles
179
What are the muscles that allow extension of the atlanto-occipital joints?
Rectus capitis posterior major and minor, obliquus capitis superior, splenius capitis, longissimus capitis, trapezius
180
What are the muscles that allow Lateral flexion of the atlanto-occipital joints?
SCM, Obliquus Capitis superior, rectus capitis lateralis, longissimus capitis, splenius capitis
181
What are the six aspects of the suboccipital triangle?
Superomedial boundary, superolateral boundary, inferolateral boundary, floor, roof, and contents.
182
What is the structure of the superomedial boundary?
Rectus capitis posterior major
183
What is the structure of the superolateral boundary?
Obliquus capitis superior
184
What is the structure of the inferolateral boundary?
Obliquus capitis inferior
185
What is the structure of the floor of the suboccipital triangle?
Posterior atlanto-occipital membrane and posterior arch of C1
186
What is the structure of the roof of the suboccipital triangle?
Semispinalis capitis
187
What is the structure of the contents of the suboccipital triangle?
Vertebral artery and suboccipital nerve
188
What are the muscles of the atlanto-axial joints rotate the head to the left?
Obliquus capitis inferior, rectus capitis posterior major and minor, longissimus capitis, and splenius capitis (ipsilateral)
189
What are the muscles of the atlanto-axial joints rotates the head to the right?
SCM and semispinalis capitis
190
Where do the suboccipital nerves originate, travel, and distribute?
Posterior ramus of C1 -> Cranium and C1 -> muscles of suboccipital triangle
191
Where do the greater occipital nerves originate, travel, and distribute?
Posterior ramus of c2 -> Obliquus capitis inferior and ascends to posterior scalp -> skin over neck and suboccipital bone
192
Where do the lesser occipital nerves originate, travel, and distribute?
Anterior rami of c2-3 -> passes directly to skin -> Skin of superior posterior/lateral neck and scalp posterior to external ear
193
Where do the posterior rami nerves of c3-7 originate, travel, and distribute?
Posterior: same -> Pass segmentally to skin and muscles -> intrinsic muscles of back and overlying skin
194
What is a back strain?
Injury to a ligament
195
What is a back sprain?
Stretching/tearing of muscle fibers
196
What is a back spasm?
Response to inflammation sudden involuntary contraction attended by cramps, pain, and interference
197
What is arteriosclerosis of the back?
Reduced blood supply = lightheaded, dizziness, and inference to blood supply to brainstem
198
How does the spinal cord begin?
As a continuation of the medulla oblongata
199
Where does the spinal cord terminate?
Conus medullaris ~ L1/L2
200
Approximately what portion of the spinal cord makes up the vertebral column?
2/3
201
In adults, how long is the spinal cord?
42-45 cm
202
What is the spinal cord considered to be?
The major reflex pathway between the body and brain
203
What are the two enlargements of the spinal cord?
Cervical enlargement, lumbosacral enlargement
204
Describe the cervical enlargement.
Extends from c4-T1, most of the anterior rami form brachial plexus of nerves that innervate the upper limbs
205
Describe the lumbosacral enlargement.
Extends from T11-S1, the anterior rami of spinal nerves make up the lumbosacral plexuses of nerves that innervate the lower limbs
206
Describe the beginning of spinal cord development in the embryonic period.
SC occupies the entire vertebral canal
207
During what developmental period does the vertebral column grow faster than spinal cord, leading to the ascension of it?
Fetal period
208
At birth, at what level is the conus medullaris?
L4-5
209
What structure forms to extend beyond the SC to reach the remaining lumbar, sacral, and coccygeal foramina?
Cauda equina
210
What is the cauda equina?
A bundle of nerve roots that courses within the lumbar cistern of CSF caudal to the termination of the SC.
211
What structure arises from the tip of the conus medullaris and decends among the spinal nerve roots in the cauda equina?
Filum terminale
212
What is the hard, outermost meninge?
Dura mater
213
What makes up the dura mater?
Tough fibrous tissue with some elastic fibers
214
What separates the dura from the periosteum-covered bone and ligaments formed by the walls of the vertebral canal?
The epidural space
215
What is the length of the epidural space?
runs the lengeth of the vertebral canal terminating superior to the foramina magnum and laterally to the IV foramina, and inferiorly to the sacral hiatus.
216
What type of nerves supply the dura mater?
afferent pain receptors by Meningeal nerves
217
What is the inflammation of meninges?
Meningitis
218
What is the subarachnoid mater?
The middle layer composed of fibrous and elastic tissue that lines the spinal dura sac and its root sheaths.
219
What hold the subarachnoid mater to the dura?
CSF pressure
220
What is the arachnoid trabeculae?
Connective tissue that spans the subarachnoid space, connecting the spinal arachnoid and pia.
221
What is bleeding in the [sub]arachnoid space?
Subdural hematoma
222
What is the pia mater?
thin, transparent Innermost covering
223
What does the pia mater directly cover?
Roots of spinal nerves and spinal blood vessels
224
What is the fibrous sheet of pia that extends between posterior and anterior nerve roots?
Dentriculate ligaments
225
What are the three longitudinal arteries that supply the spinal cord?
1. Anterior spinal artery. 2. two posterior spinal arteries
226
What derives from these ascending arteries?
Anterior and posterior segmental arteries
227
What artery reinforces circulation of 2/3s of the spinal cord?
Great anterior segmental medullary artery
228
Where does the great anterior segmental medullary artery arise and enter?
Inferior intercostal or upper lumbar artery enters VC through IV foramen and the lower thoracic or upper lumbar level
229
What supply the posterior and anterior roots of spinal nerves and their coverings?
Radicular arteries running along the nerve roots
230
How many anterior and posterior veins of the spinal cord are there?
Three anterior and three posterior
231
What direction are the veins arranged?
Longitudinally
232
What drains the anterior and posterior veins?
Anterior and posterior medullary and radicular veins
233
Describe the formation of spinal nerves/
Fusion of ventral and dorsal roots arising from the spinal cord: dorsal roots carry afferent information (contain the cell bodies in the ganglion), ventral roots carry efferent information (cell bodies are located in the gray matter), roots come together to form nerves as the exit the IV foramen, then immediately split into ventral and dorsal primary rami.
234
What increases the chance that nerve roots will be conpressed?
Narrow foramina if osteophytes or herniation of IV discs occur
235
What is myelography?
Radiopaque contrast procedure that allows for visualization of the SC and nerve roots (CSF is withdrawn and replaced w/ contrast material.)
236
What is the withdrawal of CSF from the lumbar cistern?
Lumbar spinal puncture (LP, Spinal tap)
237
How is a patient oriented when performing a spinal tap?
Lays on side with back and hips flexed (fetal position)
238
Where is the needle inserted for a spinal tap?
midline between spinous processes of L3-4.
239
How many cm in does the needle "po" the liagemtnum flavum, puncturing the dura and arachnoid space to enter the lumbar cistern?
4-6
240
What is the approximate rate of CSF escape?
One drop per second
241
Where is spinal anesthesia injected into?
Subarachnoid space
242
Tue/False: Epidural Anesthesia is also called a block.
true.
243
True/False: Ischemia (decreased blood supply) can lead to muscle weakness and paralysis.
True.
244
What can the protrusion of cervical IV discs after a neck injury cause?
Spinal cord shock
245
What does Transection to C1-C3 result in?
No function below head, ventilator required for respiration
246
What does Transection to C4-C5 result in?
quadriplegia (no function of limbs but can respirate)
247
What does Transection to C6-C8 result in?
Loss of lower limb function
248
What does Transection to T1- T9 result in?
Paraplegia (lower limb paralysis)
249
What does Transection to T10-L1 result in?
Some thigh muscle function (may be able to walk with braces)
250
What does Transection to C2-C3 result in?
Retention of most leg muscle function, short leg braces may be required.
251
What are the two branches of the major cervical and segmental arteries that supply the VC?
Periosteal and Equatorial
252
Where do spinal artery branches enter and divide?
IV foramina
253
What are the two smaller vertebral canal branches?
Anterior and posterior
254
What do the smaller anterior vertebral canal branches innervate?
ventral bodies, supplying most of the red marrow
255
What do the larger branches of artery spinal branches continue as?
Radicular or segmental medullary arteries
256
What do spinal veins form along the VC?
venous plexuses, internal and external
257
What veins form within the vertebral bodies?
Basivertebral veins
258
What veins receive veins from the SC and venous plexuses as they accompany nerves through the IV foramina and drain into vertebral veins?
Intervertebral veins
