Spinal Cord

Question 1

Medulla spinalis
Tail of the brain
2%

Answer 1

Spinal cord

Question 2

Anterior Longitudinal Ligament
Vertebral body
Intervertebral disks (in between each vertebral
body) § Posterior Longitudinal Ligament

Answer 2

Anterior to the Spinal Cord

Question 3

Skin
§ Subcutaneous tissue
§ Supraspinous ligament
§ Interspinous ligament
§ Ligamentum Flavum

Answer 3

Posterior to the Spinal cord

Question 4

Secures the Spinal Cord in the vertebral canal
Composed of fibrous, collagenous fibers that is
attached to the dura of the spinal cord

Answer 4

Denticulate Ligament

Question 5

TOPOGRAPHIC ORGANIZATION
Lower cervical to T1
Spinal nerves for Brachial plexus
Sensory nerves from upper limbs enter in this
enlargement

Answer 5

Cervical Enlargement

Question 6

§ Sensory nerves from lower limbs enters the spinal
cord from this area
§ Spinal nerves for lumbosacral plexus

Answer 6

Lumbar Enlargement

Question 7

Emerge through the intervertebral foramen, which are
located between each vertebra.

Answer 7

Spinal nerve

Question 8

Pairs of spinal nerve

Answer 8

31 pairs
§ Cervical: 8
§ Thoracic:12
§ Lumbar: 5
§ Sacral: 5
§ Coccygeal:1

Question 9

Emerge from the spinal cord to exit the spine
above their corresponding vertebra.

Answer 9

Spinal nerve c1 to c7

Question 10

Conical Termination of the Spinal Cord
Ø Spinal cord is present up until L1 or L2 of the vertebra

Answer 10

Conus Medullaris

Question 11

§ Cutaneous innervation for saddle area
§ Motor innervation for sphincters
§ Parasympathetic innervation for bladder

Answer 11

Functions of Conus medullaris

Question 12

Ø Condensed pia that extends caudally from conus
medullaris
Ø The pia is invested with dura at S2 to become coccygeal
ligament
Ø Surrounded by cauda equina, the long roots from the
lumbar and sacral regions (Lumbo-Sacral roots)

Answer 12

Filum Terminale

Question 13

Notes
Posterior horn sends axons to terminate directly at anterior horn cells or are directed to the white mater

Answer 13

Notes
White matter-dendrites and axons
Gray matter- soma of nucleus

Question 14

conducting cord composed of white matter

Answer 14

Funiculi

Question 15

Afferent fibers
enter the dorsal horn

Answer 15

Posterior/dorsal funiculus

Question 16

Efferent fibers exit through
the anterior horn

Answer 16

Anterior funiculus

Question 17

enclosed by posterior and
anterior funiculus

Answer 17

Lateral funiculus

Question 18

Contains Dorsal column pathway

Answer 18

Dorsal intermediate septum

Question 19

Carries light touch, vibratory, and joint
position senses
§ Ascending tract
§ Divided into 2 fasciculi:
o Fasciculus Gracilis
o Fasciculus Cuneatus

Answer 19

Dorsal column pathway

Question 20

Carry pain, temperature, and light touch
sensation.
§ Includes a larger lateral tract and a smaller
anterior tract
§ Ascending tract- extremities going to the
spinal cord to the thalamus

Answer 20

Spinothalamic Tract

Question 21

carries motor signals. § comprises two tracts, with the lateral tract
being the predominant one.
§ Descending tract- Cortex to the spine

Answer 21

Corticospinal tract

Question 22

Lateral spinothalamic tract

Answer 22

Pain and Temp

Question 23

Lateral spinothalamic tract
1st order neuron

Answer 23

Dorsal Root Ganglion
(Spinal ganglion)

Question 24

Lateral spinothalamic tract
2nd order neuron

Answer 24

Gray matter (lamina I,IV,V)

Question 25

Axons of the 2nd order neurons decussate at the?

Answer 25

Anterior white commissure

Question 26

3rd order neuron

Answer 26

Thalamus

Question 27

Axons of the third order neurons pass through the?

Answer 27

Internal capsule

Question 28

Termination?

Answer 28

Primary Somesthetic Area (Brodmann 1,2,3)

Question 29

surrounds the central canal § lined by ependymal cells similar to the ventricles

Answer 29

Substantia Gliosa

Question 30

Low neural density Dorsal part of dorsal horn Neurons at this area are non myelinated or thinly myelinated.

Answer 30

LAMINA 1

Question 31

Covering of Lamina I (Tip of the dorsal horn) Most numerous in Lumbosacral region

Answer 31

Posteromarginal nucleus

Question 32

Corresponds to substantia gelatinosa Cells (tightly packed)

Answer 32

LAMINA II

Question 33

motor neurons, General somatic efferent neurons nerve cells that carry signals from the brain to the skeletal muscles to initiate voluntary muscles to initiate voluntary movmt

Answer 33

Somatic Efferent Neuron

Question 34

Receives collateral or direct termination of dorsal root fibers

Answer 34

Intermediate Gray Zone

Question 35

“Posterior Thoracic Nucleus” or “Nucleus Dorsalis”

Answer 35

Dorsal nucleus of Clarke