Chapters 12: Muscles of the Appendicular Skeleton Flashcards
protracts shoulder and rotates scapula and depresses apex of shoulder
pectoralis minor
prime mover of forward reaching, throwing, and pushing actions; “boxer muscle”
serratus anterior
stabilizes, raises, retracts, and rotates scapula
trapezius
elevates adducts and rotates scapula
levator scapulae
retracts scapula and brace shoulder
rhomboid major and minor
prime mover of arm flexion; rotates arm medially, adducts arm
pectoralis major
prime mover of arm extension; adduction and medial rotation at shoulder
latissimus dorsi
prime mover of arm abduction
deltoid
Rotator cuff
Supraspinatus, infraspinatus, teres minor, subscapularis; reinforces joint capsule and holds head of humerus in glenoid cavity
initiates abduction of scapula, prevents downward dislocation of humerus
supraspinatus
rotates humerus laterally, stabilizes shoulder
infraspinatus
prevents humeral head from sliding upward as arm is abducted; medially rotates humerus
subscapularis
prevents humeral head from sliding upward as arm is abducted; extends and laterally rotates humerus
teres minor
prime mover of elbow flexion; origin ont of distal humerus; insertion coronoid process of ulna
brachialis
flexes and supinates elbow; origin coracoid process of scapula and supraglenoid tubercle of humerus
biceps brachii