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Cubital Fossa Anatomy


Cubital Fossa Anatomy
The cubital fossa is a triangular space in front of the elbow joint, bounded laterally by brachioradialis and medially by pronator teres (Fig. 3.28). By convention, the fossa is limited proximally by an imaginary line drawn between the two humeral epicondyles. The roof is formed by deep fascia, reinforced by the aponeurosis of biceps (Fig. 3.26).
The subcutaneous tissue overlying the roof contains branches of the lateral and medial cutaneous nerves of forearm and superficial veins such as the median cubital vein, which links the cephalic and basilic veins (Fig. 3.25). The arrangement of these superficial veins, which are often punctured to obtain samples of blood for laboratory analysis, may vary considerably between individuals.

The fossa is traversed by nerves and vessels passing between the arm and the forearm. Its contents (Figs 3.27 & 3.29), embedded in fatty connective tissue, are, from medial to lateral, the median nerve, the brachial artery and its venae comitantes, the tendon of biceps and the radial nerve. Distally, the terminal branches of the radial nerve, the superficial and deep radial (posterior interosseous) nerves, and the terminal branches of the brachial artery (namely the radial and ulnar arteries) also lie within the fossa. The floor of the cubital fossa (Fig. 3.29) is formed by supinator and brachialis overlying the capsule of the elbow joint.

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