Arm Anatomy

 Humerus - Anterior view  

arm cross sectional anatomy

 Muscles of the Arm

  Muscle Innervation Origin Insertion Action Nerve Root
1 Coracobrachialis Musculocutaneous Coracoid mid.humerus medial Flexion, adduction C5,6,7 lat cord  
2 Biceps Musculocutaneous Coracoid(SH), Supraglenoid (LH) Radial tuberosity Supination, flexion C5,6 lat cord  
3 Brachialis Musculocutaneous-medial, radial lateral Ant. Humerus Ulnar tuberosity (ant) Flexes forearm C5,6 lat/post cord  
4 Triceps Radial Infraglenoid(LH), Post.Humerus(lat H.), Post. Humerus (MH) Olecranon Extends forearm C6,7,8,T1 post cord  

Nerves of the Arm

  • Median nerve
  • Radial nerve
  • Ulnar nerve
  • Musculocutaneous nerve
  • Lateral antebrachial cutaneous nerve
  • Lateral Brachial cutaneous nerve: Branch of radial nerve.

Arteries and Veins of the Arm

  • Cephalic vein
  • Brachial artery and veins