Muscles

Question 1

Which muscles are innervated by the suprascapular nerve

Answer 1

Infraspinatus & supraspinatus

Question 2

What is the supraspinatus’ main muscle action

Answer 2

Abduction of GH joint

Also: ER

Question 3

What is the main muscle action of the infraspinatus?

Answer 3

ER of GH joint

Also: also horiz abduction

Question 4

What innervates the teres minor

Answer 4

Axillary nerve

Question 5

What innervates the subscapularis

Answer 5

Upper & lower subscapular nerves

Question 6

What is the teres minor muscle action

Answer 6

ER GHJ
Horiz abd GHJ
Adduct GHJ

Question 7

What does the sternocleidomastoid do

Answer 7

Cervical extension, ipsilateral sidebend, contralateral rotation

Question 8

Which nerve innervates the SCM

Answer 8

Accessory nerve (CN XI)

Question 9

What does the subclavius do?

Answer 9

Stabilize the clavicle

Question 10

Which nerve innervates the subclavius

Answer 10

Subclavian nerve

Question 11

What is the muscle action of the pectoralis minor

Answer 11

Anterior tip of scapula
Abduct/protract scapula
Downward rotate scapula
Depress scapula

Question 12

Which muscles contribute to downward rotation of the scapula

Answer 12

Rhomboid major & minor
Levator Scapulae
Serratus Anterior (superior)
Pectoralis minor
Pectoralis major (sternal)

Question 13

Which nerves innervate the pectoralis minor

Answer 13

Medial & lateral pectoral nerves

Question 14

How do the superior & inferior fibers of the serratus anterior differ?

Answer 14

Superior fibers: elevate & downward rotate scapula

Inferior fibers: depress & upward rotate scapula

Question 15

Which nerve innervates the serratus anterior

Answer 15

Long thoracic nerve

Question 16

Whis is muscle action of all fibers of serratus anterior

Answer 16

Abduct/protract scapula

Stabilize medial border of scapula

Question 17

Which portions of the trapezius elevate the scapula?

Answer 17

Trap I & II (descending)

Question 18

Which portions of the trapezius depress the scapula?

Answer 18

Trapezius IV (ascending)

Question 19

What are the muscle actions of the trapezius III (transverse)?

Answer 19

Adduct/retract scapula

Question 20

Which nerve innervates the trapezius?

Answer 20

Accessory nerve (CN XI)

Question 21

What are the muscle actions of the trapezius IV (ascending)?

Answer 21

Upward rotation
Depression
Adduct/retraction

Question 22

What are the muscle actions of the descending trapezius (I & II)?

Answer 22

Upward rotation
Elevation
Adduction/retraction
Ipsilateral side bend
Contralateral rotation

Question 23

What are the muscle actions of the levator scapulae?

Answer 23

Elevate scapula

Downward rotate scapula

Question 24

Which muscles are innervated by the dorsal scapular nerve?

Answer 24

Rhomboid major & minor

Levator scapulae

Question 25

Which nerve innervates the deltoids?

Answer 25

Axillary

Question 26

Which nerve innervates the latissimus dorsi

Answer 26

Thoracodorsal

Question 27

Which nerve innervates the teres major

Answer 27

Lower subscapular nerve

Question 28

Which nerve innervates the pectoralis major?

Answer 28

Medial & lateral pectoral nerves

Question 29

Which nerve innervates the coracobrachialis

Answer 29

Musculocutaneous

Question 30

What is the middle deltoid muscle action?

Answer 30

GH Abduction

Question 31

What are the muscle actions of the anterior deltoid?

Answer 31

``` Add GH at <60 abd Abd GH >60 abd Flex GH IR GH Horiz adduct GH ```

Question 32

What are the muscle actions of the posterior deltoid?

Answer 32

``` Abd GH at >60 abd Add GH at <60 abd Ext GH ER GH Horiz abd GH ```

Question 33

What are the muscle actions of the latissimus dorsi?

Answer 33

``` Add GH Ext GH IR GH Horzi abduct GH Retract scapula Downward rotate scapula Depress scapula ```

Question 34

Teres major musle action

Answer 34

Add GH Ext GH Ir GH Horiz abd GH

Question 35

Which muscles adduct the GH?

Answer 35

``` Pectoralis major Latissimus dorsi Teres major & minor Ant & Post deltoid if <60 degrees flexion Coracobrachialis ```

Question 36

Which muscles are innervated by the radial nerve?

Answer 36

Triceps Anconeus Brachioradialis