Unit 12: Upper Extremity - Muscles that Move the Shoulder Joint

flexion of shoulder joint

raising arms up

extension of shoulder joint

lower arms back down

flexion of shoulder joint

raising arms up

extension of shoulder joint

lower arms back down

abduction of shoulder joint

arms move away from body, decrease in angle

adduction of shoulder joint

arms move toward midline of the body, increase in angle

external rotation of shoulder joint

lateral, move arm away from stomach

internal rotation of shoulder joint

medial, move arm toward stomach

horizontal abduction of shoulder joint

arms are straight out in front of body and they move away from body; transverse plane

horizontal adduction of shoulder joint

arms are straight out at side of the body and move toward the midline of body; transverse plane

flexion

anterior deltoid

pectoralis major

coracobrachialis

biceps brachii

extension

latissimus dorsi

teres major

posterior deltoid

infraspinatus

teres minor

triceps brachii

abduction

supraspinatus

middle deltoid

adduction

pectoralis major

coracobrachialis

teres major

latissimus dorsi

horizontal abduction

posterior deltoid

teres major

teres minor

infraspinatus

horizontal adduction

anterior deltoid

pectoralis major

internal rotation

anterior deltoid

pectoralis major

subscapularis

teres major

latissimus dorsi

external rotation

infraspinatus

teres minor

posterior deltoid

*also supraspinatus (don't need to know)

origin, insertion, and action of the pectoralis major

origin: clavicular head - medial half of clavicle

sternal head - sternum, cartilages of first 6 ribs

insertion: bicipital groove

action: flexion, adduction, horizontal adduction, internal rotation

origin, insertion, and action of the biceps brachii

origin: long head - supraglenoid tubercle

short head - coracoid process

insertion: radial tuberosity

action: flexion

origin, insertion, and action of the triceps brachii

origin: long head - infraglenoid tubercle

lateral head - proximal half of posterior humerus

medial head - distal half of posterior humerus

insertion: olecranon process

action:

origin, insertion, and action of the latissimus dorsi

origin: lower vertebrae, lower ribs, iliac crest

insertion: bicipital groove

action: extension, adduction, internal rotation

origin, insertion, and action of the supraspinatus

origin: supraspinous fossa of scapula

insertion: greater tubercle of humerus

action: abducts arm

origin, insertion, and action of the infraspinatus

origin: infraspinous fossa of scapula

insertion: greater tubercle of humerus

action: rotates arm laterally/external

Muscles of the rotator cuff

supraspinatus, infraspinatus, teres minor, subscapularis

deltoid

shoulder

pectoralis major

chest muscle

infraspinatus

teres major

teres minor

biceps brachii

triceps brachii

latissimus dorsi