UE: Muscle action and innveration Flashcards
pectoralis major action
- flexion, MR, add, and horizontal add shoulder
- scapular protraction and depression
pectoralis minor action
- downward rotation of scapula
- scapular protraction and depression
pectoralis major innervation
lateral pectoral C5-T1
pectoralis minor innervation
medial pectoral C6-T1
serratus anterior action
- upward rotation of scapula
- scapular protraction and depression
serratus anterior innervation
long thoracic C5-8
upper trapezius action
- bilaterally: extends head and neck
- unilaterally: laterally flex head and neck to same side, rotate head and neck to opposite side, scapular elevation and upward rotation
middle trapezius action
scapular retraction and stabilization; and upward rotation
lower trapezius action
scapular depression and upward rotation
trapezius innervation
spinal accessory nerve (CN 11)
rhomboid major and minor action
add, elevate, and downward rotation of scapula
rhomboid major and minor innervation
dorsal scapular C4-5
levator scapulae action
- unilateral: scapular elevation and downward rotation & laterally flex and rotate head and neck to same side
- bilateral: extend head and neck
levator scapulae innervation
ventral rami of spinal nerves C3-4 & dorsal scapular nerve C4-5
sternocleidomastoid action
- unilateral: flex neck to same side & rotate neck to opposite side
- bilateral: flex neck
sternocleidomastoid innervation
spinal accessory nerve (CN 11)
latissimus dorsi action
MR, add, and extension of shoulder
latissimus dorsi innervation
thoracodorsal nerve C6-8
deltoid action (all, anterior, posterior)
- all: abduct shoulder
- anterior: flex, MR, and horizontal add shoulder
- posterior: extend, LR, and horizontal abd shoulder
deltoid innervation
axillary nerve C5-6
teres major action
MR, extend, and add shoulder
teres major innervation
lower subscapular C5-7
coracobrachialis action
flex and add shoulder
coracobrachialis innervation
musculocutaneous C6-7
