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When viewed in cross-section the arm consists of skin and subcutan-
viding muscular supply to the flexor compartment, this nerve pierces
eous tissue in which the superficial veins and sensory nerves course.
the deep fascia in the mid-arm to become the lateral cutaneous nerve of
Below lies a deep fascial layer. Medial and lateral intermuscular septa
the forearm): see p. 71.
arise from the supracondylar lines of the humerus and extend to the • The musculocutaneous nerve and branches (remember that, after pro-
deep fascia thereby dividing the arm into anterior and posterior • The basilic vein (in the upper arm onlyain the lower arm it is sub-
compartments. cutaneous): see p. 69.
The anterior (flexor) compartment contents include (Figs 35.1 The posterior (extensor) compartment contents include
and 35.3): (Figs 35.2 and 35.3):
• The flexor muscles: coracobrachialis, biceps and brachialis (see • The extensor muscles: triceps (see Muscle index, p. 162).
Muscle index, p. 162). • The radial nerve and branches: see p. 71.
• The brachial artery and branches: see p. 67. • The profunda brachii artery: see p. 67.
• The median nerve: see p. 71. • The ulnar nerve (in the lower arm only): see p. 73.
• The ulnar nerve (in the upper arm onlyaas it pierces the medial inter-
muscular septum to pass into the posterior compartment in the mid-
arm): see p. 73.

The arm 81