Shoulder Muscle Actions + Innervations Flashcards
supraspinatus innervation
suprascapular nerve (C5-C6)
supraspinatus action
shoulder abduction
+ stabilization
infraspinatus innervation
suprascapular nerve (C5-C6)
infraspinatus action
shoulder external rotation + stabilization
teres minor innervation
axillary nerve (C5-C6)
teres minor action
shoulder external rotation + stabilization
teres major innervation
lower subscapular nerve (C5-C6)
teres major action
shoulder adduction, internal rotation, and external rotation
triceps brachii innervation
radial nerve (C6-C8)
triceps brachii action
long head: shoulder extension + adduction
all: elbow extension
latissimus dorsi innervation
thoracodorsal nerve (C6-C8)
latissimus dorsi action
shoulder extension, internal rotation, and external rotation
deltoid innervation
axillary nerve (C5-C6)
deltoid action
shoulder flexion, extension, aduction, internal rotation, and external rotation
subclavius innervation
subclavian nerve (C5-C6)
subclavicus action
depression of clavicle
sternocleidomastoid innervation
spinal accessory nerve (CN XI)
sternocleidomastoid action
shoulder + thorax elevation
pectoralis major innervation
lateral pectoral nerve (C5-C7) + medial pectoral nerve (C8-T1)
pectoralis major action
shoulder flexion, adduction, and internal rotation
pectoralis minor innervation
medial pectoral nerve (C8-T1)
pectoralis minor action
depression + anterior tilt of scapula, elevates ribs
biceps brachii innervation
musculocutaneous nerve (C5-C6)
biceps brachii action
shoulder flexion
elbow flexion
forearm supination
shoulder adduction
coracobrachialis innervation
musculocutaneous nerve (C5-C7)
coracobrachialis action
shoulder flexion
shoulder adduction
subscapularis innervation
upper + lower subscapular nerves (C5-C6)
subscapularis action
shoulder adduction + internal rotation
