Atlas of Human Anatomy by Netter

Triceps brachii

Main extensor of arm

Stabilizes head of humerus in glenohumeral joint

Anconeus: extends arm, and resists adduction of the ulna during pronation

Muscles Origin Insertion Innervation Blood supplyAction

Biceps brachii Long head-supraglenoid tubercle of

humerus; Short head-tip of coracoid process

of scapula

Radial

tuberosity, fascia

of forearm via

bicipital

aponeurosis

Musculocutaneous

nerve (C5,C6)

Muscular

branches of

brachial

artery

Supinates

forearm

Flexes

forearm when

it is supinated

CoracobrachialisTip of coracoid process of scapula Middle third of

medial surface

of humerus

Musculocutaneous

nerve (C5,C6,C7)

Muscular

branches of

brachial

artery

Flexes and

adducts arm

Brachialis Distal half of anterior surface of humerus Coronoid

process and

tuberosity of ulna

Musculocutaneous

nerve (C5,C6)

Radial

recurrent

artery,

muscular

branches of

brachial

artery

Flexes

forearm

Triceps brachii Long head-infraglenoid tubercle of scapula;

Lateral head -upper half of posterior

humerus; Medial head -distal two thirds of

medial and posterior humerus

Posterior

surface of

olecranon

process of ulna

Radial nerve

(C6,C7,C8)

Branch of

profunda

brachii artery

Extends

forearm, long

head

stabilizes

head of

abducted

humerus

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Cutaneous Nerves of Arm

Supraclavicular nerves (C4,C5) supply skin over shoulder

Superior lateral cutaneous nerve (C5,C6)

Branch of axillary

Supplies skin over upper lateral arm

Inferior lateral cutaneous nerve (C5,C6)

Cutaneous branch of radial nerve

Supplies skin over lower lateral arm

Intercostobrachial nerve (T2)

Lateral cutaneous branch of second intercostal nerve

Supplies upper medial arm anteriorly and posteriorly

Medial brachial cutaneous (C8-T1)

Branch of brachial plexus

Supplies lower anterior medial arm

Posterior brachial cutaneous nerve (C5-C8)

Branch of radial nerve

Supplies lower posterior medial arm

Cubital Fossa

Boundaries

Superiorly: (imaginary) line connecting the medial and lateral epicondyles

Medially: pronator teres muscle

Laterally: brachioradialis

Floor: brachialis and supinator muscles of arm and forearm

Roof: deep fascia, bicipital aponeurosis, subcutaneous tissue, and skin

Contents

Brachial artery (terminal part)

Biceps brachii tendon

Nerves: median

In subcutaneous connective tissue

Medial and lateral antebrachial cutaneous nerves

Basilic and cephalic veins

Median cubital vein

In floor of fossa

Deep and superficial branches of radial nerve