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trapezius Origin
superior nuchal line, external occipital protuberance, ligamentum nuchae, spinous processes of C7-T12
trapezius Insertion
lateral 1/3 clavicle, acromion, spine of scapula
trapezius Innervation
CN XI (spinal accessory nerve)
trapezius Action
rotates, elevates, retracts, and depresses scapula
latissimus dorsi Origin
spinous processes of T6-L5, sacrum, iliac crest, ribs 10-12
latissimus dorsi Insertion
intertubercular groove of humerus
latissimus dorsi Innervation
thoracodorsal nerve
latissimus dorsi Action
extends, adducts, and medially rotates humerus
levator scapulae Origin
transverse processes of C1-C4
levator scapulae Insertion
superior angle of scapula
levator scapulae Innervation
dorsal scapular nerve
levator scapulae Action
elevates and rotates scapula
rhomboid major and minor Origin
spinous processes of C7-T5
rhomboid major and minor Insertion
medial border of scapula
rhomboid major and minor Innervation
dorsal scapular nerve
rhomboid major and minor Action
retracts, elevates, and rotates scapula
deltoid Origin
spine of scapula, acromion, lateral 1/3 clavicle
deltoid Insertion
deltoid tuberosity
deltoid Innervation
axillary nerve
deltoid Action
abducts, flexes, extends, and rotates arm
supraspinatus Origin
supraspinous fossa
supraspinatus Insertion
superior facet of greater tubercle
supraspinatus Innervation
suprascapular nerve
supraspinatus Action
abducts arm
infraspinatus Origin
infraspinous fossa
infraspinatus Insertion
middle facet of greater tubercle
infraspinatus Innervation
suprascapular nerve
infraspinatus Action
laterally rotates arm
teres major Origin
lateral scapular border superior to inferior angle
teres major Insertion
medial lip of intertubercular sulcus
teres major Innervation
lower subscapular nerve
teres major Action
medially rotates and adducts arm; extends flexed arm
teres minor Origin
lateral scapular border superior to teres major
teres minor Insertion
inferior facet of greater tubercle
teres minor Innervation
axillary nerve
teres minor Action
laterally rotates arm
long head triceps Origin
infraglenoid tubercle of scapula
long head triceps Insertion
olecranon process
long head triceps Innervation
radial nerve
long head triceps Action
extends forearm
subscapularis Origin
subscapular fossa
subscapularis Insertion
lesser tubercle of humerus
subscapularis Innervation
upper and lower subscapular nerves
subscapularis Action
medially rotates arm
pectoralis major Origin
medial 1/2 clavicle and anterior sternum
pectoralis major Insertion
lateral lip of intertubercular sulcus
pectoralis major Innervation
medial and lateral pectoral nerves
pectoralis major Action
flexes, adducts, and medially rotates arm
pectoralis minor Origin
ribs 3-5
pectoralis minor Insertion
coracoid process
pectoralis minor Innervation
medial pectoral nerve
pectoralis minor Action
pulls shoulder down and protracts scapula
subclavius Origin
first rib
subclavius Insertion
inferior surface of clavicle
subclavius Innervation
nerve to subclavius
subclavius Action
pulls shoulder down and stabilizes sternoclavicular joint
serratus anterior Origin
lateral surface of upper 8-9 ribs
serratus anterior Insertion
costal surface of medial scapular border
serratus anterior Innervation
long thoracic nerve
serratus anterior Action
protracts, rotates, and depresses scapula