Muscles - Origins, insertion, action

Sternocleidomastoid

manubrium of sternum

mastoid process

flexion of neck

pectoralis major

sternum

intertubercular groove of humerus

flexion of humerus

trapezius

occipital processes of C7-T12

Lateral clavicle

lateral rotation

deltoid

lateral clavicle

deltoid tuberosity of humerus

aids rotation of arm

latissimus dorsi

aponeurosis from T7 to posterior 3rd of iliac crest

intertubercular groove of humerus

extension of humerus

serratus anterior

outer anterior surface of upper 8 ribs

vertebral border of scapula

protraction of scapula

rhomboids

spinous process C7-T5

vertebral border of scapula

retraction of scapula

teres major

inferior angle of scapula

intertubercular groove of humerus

medial rotation of humerus

supraspinatus

supraspinous fossa of scapula

greater tubercle of humerus

stabilizes shoulder joint

infraspinatus

infraspinous fossa of scapula

greater tubercle of humerus

stabilizes shoulder joint

teres minor

lateral border of scapula

greater tubercle of humerus

stabilizes shoulder joint

subscapularis

subscapular fossa of scapula

lesser tubercle of humerus

stabilizes shoulder joint

biceps brachii

long head: supraglenoid tubercle of scapula

radial tuberosity

flexion of elbow

triceps brachii

long head: infraglenoid tubercle of scapula

olecranon process of ulna

extension of elbow

brachioradialis

lateral supracondylar ridge of humerus

styloid process of radius

flexes elbow

pronator teres

coronoid process of ulna

lateral shaft of radius

flexes elbow