A&P 1 primary arm&chest muscles

Pectoralis major - Region

chest

Pectoralis major - Origin

clavicle, sternum, and costal cartilages of ribs 2–6 (or 1–7)

Pectoralis major - Insertion

humerus

Pectoralis major - Action

flexion, adduction, and rotation of arm

Pectoralis major - Innervation

medial and lateral pectoral nerves

Biceps brachii - Region

anterior arm

Biceps brachii - Origin

scapula (2 heads)

Biceps brachii - Insertion

radial tuberosity of radius

Biceps brachii - Action

flexes elbow; supinates forearm

Biceps brachii - Innervation

musculocutaneous nerve

Triceps brachii - Region

posterior arm

Triceps brachii - Origin

scapula and humerus (3 heads)

Triceps brachii - Insertion

olecranon of ulna

Triceps brachii - Action

extends forearm

Triceps brachii - Innervation

radial nerve

Brachioradialis - Region

lateral forearm

Brachioradialis - Origin

lateral border of distal humerus

Brachioradialis - Insertion

superior to styloid process of radius

Brachioradialis - Action

flexes forearm

Brachioradialis - Innervation

radial nerve