medial half of clavicle

sternum

costal cartilage

aponeurosa of external ab. oblique

Action Pec. Major

Spinous Processes lower thoracic, lumbar, and upper sacral vert.

Iliac crest

Lower ribs

Adduct, medially rotate, extend arm

Prevents upward displacment humerus

Nerve Lats

lateral 1/3 clavicle

acromion

spine of scapula

upper fibers elevate scapula

middle fibers retract scapula

lower fibers depress scapula

acts synergistically with lower serratus anterior to abduct arm to 90

Action Corocobrachialis

Muskulocutaneous

abduct arm to horizontal

ant. fibers flex and IR humerus

post. fibers extend and ER humerus

Insertion infraspinatus

laterally rotate arm

aids inferior glide of humeral head during abduction

Long Head- supraglenoid tubercle

Short head-coracoid process

radial tuberosity

antebrachial fascia via bicipital aponeurosis

Long head-infraglenoid tubercle

Lat. head- lateral border humerus superior to radial groove

Med. head-post. surface inferior to radial groove

initiator of abduction

holds head of humerus in glenoid fossa

lower part ligamentum nuchae

spinous process CV7 to TV1

Insertion Serratus Anterior

pull scapula away from medline

moves inferior angle laterally to assist in abd. above horizontal

Laterally rotate arm

aids inferior glide of humeral head during abd.

Insertion Brachialis

adduct and IR arm

aid inferior glide of head during abd.

medial lip intertubercle grove

lower subscap

lateral epicondyle

supinator crest and supinator fossa of ulna

initiate supination and pronation

flex forearm

Ligamentum nuchae

spinous process lower CV and upper TV

common flexor tendon

caronoid process

origin f.c.u

common flexor tendon

medial side olecranon

origin f.c.r.

flex adn abduct hand

slight flex and pronate forearm

origin e.c.r.b