muscles anatomy

Origin

Insertion

Action

coracobrachialis
(deepest underarm)

coracoid process of scapula

medial midshaft of humerus

humerus: flexion, medial rotation, abduction biceps brachii

short head ­ coracoid process of scapula long head ­ supraglenoid tubercle of scapula

radial tuberosity, bicipital aponerousis humerus: flexion forearm: supination, flexion

brachialis
(in b/w)

anterior distal half of humerus

tuberosity of ulna

forearm: flexion

brachioradialis
(long, to radius)

lateral supracondylar ridge of humerus

styloid process of radius

forearm: flexion

triceps brachii

long head ­ infraglenoid tubercle of scapula lat. head ­ posterior humerus proximal to radial groove med. head ­ posterior humerus distal to radial groove

olecranon of ulna

humerus: extension, lateral rotation forearm: extension

deltoid

ant. fibers ­ lateral third of clavicle lat. fibers ­ acromion of scapula post. fibers ­ spine of scapula

deltoid tuberosity

humerus: flexion, medial/ lateral rotation

pectoralis major
(chest)

medial half of clavicle costal cartilage 1­7 aponeurosis of external oblique

greater tubercle of humerus

humerus: flexion, medial rotation, adduction pectoralis minor

anterior surface of ribs 3­7

coracoid process of scapula

scapula: depression

serratus anterior

anterior part on medial border of scapula scapula: protraction

latissimus dorsi

inferior angle of scapula iliac crest thoracolumbar fascia

medial lip of intertubercular sulcus

humerus: extension, medial rotation, adduction pronator teres
(elbow to midshaft, diagonal) medial epicondyle of humerus coronoid of ulna

mid shaft radius

forearm: pronation

palmaris longus

medial epicondyle of humerus

palmar aponeurosis

wrist: flexion palm: tightening

flexor