Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

COM MSK > Back Myology > Flashcards

Back Myology Flashcards

(54 cards)

Start Studying
1
Q

Innervation for superficial 3 layers of back

A

Branch of an anterior ramus or cranial nerve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Innervation for deep three layers of back

A

Posterior rami

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Trapezius OIN (origin, insertion, innervation)

A

O- spinous processes of C7-T12, ligamentum nuchae, external occipital protuberance and medial 1/3 of superior nuchal line
I- Lateral 1/3 of clavicle, acromion and scapular spine
N- Motor- CN XI
Sensory- C3, 4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Latissimus dorsi OIN

A

O- spinous processes of T6-12, L1-5, ribs 9-12, iliac crest and median sacral crest via thoracolumbar fascia
I- floor of the humeral intertubercular groove
N- Thoracodorsal N (C6-C8)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Trapezius action

A

Whole muscle- rotates point of the glenoid cavity superiorly, retracts scapula
Upper fibers- elevate scapula
Lower fibers- depress scapula
With scapula fixed, upper fibers will extend the neck bilaterally, laterally flex the neck and rotate the face away when working unilaterally

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Latissimus dorsi action

A

Extend, adduct and medially rotate humerus, rotate glenoid cavity inferiorly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Layer 2 muscles include

A

Rhomboid major/minor

Levator scapulae

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Rhomboid major OIN

A

O- Spinous processes of T2-T5
I- medial border of scapula (inferior to scapular spine)
N- Dorsal scapular nerve C4,5

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Rhomboid major action

A

Retract and elevate scapula, rotate glenoid cavity inferiorly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Rhomboid minor OIN

A

O- spinous processes of C7-T1, lower part of ligamentum nuchae
I- medial border of scapula (at scapular spine)
N- Dorsal scapular nerve C4,5

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Rhomboid minor action

A

Retract and elevate scapula, rotate glenoid cavity inferiorly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Levator scapulae OIN

A

O- posterior tubercles of transverse processes C1-4
I- medial border of scapula (superior to scapular spine)
N- C3,4 Dorsal scapular C5

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Levator scapulae action

A

Elevate scapula, rotate glenoid cavity inferiorly, laterally flex neck when scapula is fixed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Layer 3 muscles include

A

Serratus posterior superior

Serratus posterior inferior

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Serratus posterior superior OIN

A

Nuchal line and spinous processes C7-T3
I- superior surfaces of ribs 2-4
N- Intercostal nerve 2-5

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Serratus posterior inferior OIN

A

O-Spinous processes T11-L2
I- superior surfaces of ribs 8-12
N- anterior rami T9-12

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Serratus posterior superior/inferior action

A

Superior- elevate ribs with forced inspiration

Inferior- depress ribs with forced expiration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Layer 4 muscles include

A

Splenius capitis

Splenius cervicis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Splenius capitis OIN

A

O- Lower 1/2 nuchal line, spinous process C7-T3(4)
I- mastoid process of temporal bone, lateral 1/3 superior nuchal line of occipital bone
N- posterior rami C3-5

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Splenius capitis/cervicis action

A

Extend neck when working bilaterally, laterally flex neck and rotate face toward when working unilaterally

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Splenius cervicis OIN

A

O- spinous processes T3-6
I- Transverse processes C1-3(4)
N- Posterior rami C5-7

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Layer 5 muscles

Study These Flashcards
A

Erector spinae group:
Iliocostalis (lateral group)
Longissimus (intermediate group)
Spinalis (medial group)

23
Q

Action and innervation of all erector spinae group muscles

Study These Flashcards
A

A- maintain erect posture and extend the vertebral column and head when working bilaterally. Laterally flex the vertebral column when working unilaterally
N- Segmentally innervated by posterior rami of spinal nerves

24
Q

Iliocostalis lumborum OI

Study These Flashcards
A

O- posteromedial iliac crest, spinous processes T11-L5, median sacral crest, lateral sacral crest, sacrotuberous ligament and long posterior sacroiliac ligament
I- Costal angles of ribs 6-12

25
Iliocostalis thoracic OI
O- costal angles of ribs 6-12 | I- costal angles of ribs 1-6 and transverse process C7
26
Iliocostalis cervicis OI
O- costal angles of ribs 3-6 | I- posterior tubercles of transverse processes C4-6
27
Longissimus thoracis OI
O- common origin with iliocostalis lumborum, transverse and accessory processes L1-5 I- Transverse processes T1-L2, Ribs 3-12 b/w costal angle and costal tubercle
28
Longissimus cervicis OI
O- transverse processes T1-5 | I- posterior tubercles of transverse processes and articular processes of C2-6
29
Longissimus capitis OI
O- transverse processes T1-5, articular processes C4-7 | I- mastoid process of temporal bone
30
Spinalis thoracis OI
O- spinous processes T11-L2 | I- spinous processes T1-4
31
Spinalis cervicis OI
O- Spinous processes T1-6 | I- spinous processes C2 (3,4)
32
Spinalis capitis
Usually absent or blended with semispinalis capitis
33
Strain vs sprain
Strain involves excessive stretching or tearing of muscle fibers from overly strong contraction Sprain is an injury to the ligamentous attachments between bone- due to inadequate stretching
34
Layer 6 muscles include, and what innervates them
``` Semispinalis group Multifidus Rotatores longus Rotatores brevis Innervated by posterior rami ```
35
Semispinalis thoracis OI
O- transverse processes T6-12 | I- spinous processes C6-T4
36
Semispinalis cervicis OI
O- Transverse processes T1-6 | I- Spinous processes C2-5
37
Semispinalis thoracis/cervicis action
Extend spine and rotate spine away
38
Semispinalis capitis OI
O- transverse proc. C7-T6, articular processes C4-6 | I- b/w superior/inferior nuchal lines of occipital bone
39
Semispinalis capitis action
Extend head, rotate face away
40
Multifidus OI
O- mamillary processes of lumbar vertebrae, transverse processes of thoracic vertebrae and articular processes of C4-7 I- spinous processes three numeric segments superior, does not insert onto atlas
41
Multifidus action
Extend spine, rotate spine away
42
Rotatores longus OI and action
O- transverse processes I- roots of spinous processes 2 segments superior A- Extend spine, rotate spine away
43
Rotatores brevis OI and action
O- transverse processes I- roots of spinous processes 1 segment superior A- extend spine, rotate spine away
44
Interspinalis OIN and action
O- spinous process I- adjacent spinous process N- posterior rami A- Extend spine
45
Intertransversarii OIN and action
O- transverse process I- adjacent spinous process N- posterior rami A- extend spine
46
Levator costarum longus OIN and action
O- transverse processes C7-T11 I- 2nd rib inferior to origin N- posterior rami A- elevate ribs
47
Levator costarum brevis OIN and action
O- transverse processes C7-T11 I- adjacent rib inferior to origin N- posterior rami A- elevate ribs
48
Rectus capitis posterior major OIN and action
O- spinous process C2 I- lateral portion of inferior nuchal line N- suboccipital nerve A- extend head, rotate face toward
49
Rectus capitis posterior minor OIN and action
O- posterior tubercle of C1 I- below inferior nuchal line N- suboccipital nerve A- extend head
50
Obliquus capitis inferior OIN and action
O- spinous process C2 I- transverse process C1 N- suboccipital nerve A- rotate face forward
51
Obliquus capitis superior OIN and action
O- transverse process C1 I- b/w superior and inferior nuchal lines N- suboccipital nerve A- extend and laterally flex head
52
Boundaries of suboccipital triangle include
Rectus capitis posterior major (medial), obliquus capitis inferior (inferior), obliquus capitis superior (lateral)
53
Contents of suboccipital triangle
``` Vertebral artery travels through the floor Suboccipital nerve (which is the posterior ramus of the 1st cervical spinal nerve) and innervates musculator of suboccipital region ```
54
Suboccipital muscles include
Rectus capitis posterior major/minor | Obliquus capitis inferior/superior

COM MSK (35 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions