The cubital fossa is triangular in shape, and thus has three borders:
• Superior border– An imaginary line between the epicondyles of the humerus.
• Lateral border – The medial border of the brachioradialis muscle
• Medial border– The lateral border of the pronator teres muscle
The floor is formed proximally by brachialis and distally by supinator, the roof is skin and fascia along with the bicipital aponeurosis
Supracondylar fracture is a common fracture, occurring just above the humeral condyles.The causes a posterior displacement of the distal part in relation to the humerus, potentially damaging the contents of the fossa directly or through stretching of the structures. This may cause brachial artery occlusion or median or radial nerve injury. It is therefore vital that distal neurovascular status is assessed and documented when seeing these injuries.
Venepuncture is commonly performed at the cubital fossa. Whilst not strictly part of the contents, the median cubital vein traverses the roof to connect the cephalic and basillic veins and is reliably located just lateral to the biceps tendon. It is important to ensure the vessel is not pulsatile before puncture as the brachial artery is close by.
Brachial pulse and artery are palpable medial to the biceps tendon. It is here that the vessel is auscultated for Korotov sounds when measuring blood pressure, assessed with Doppler ultrasound for ABPI measurement and may even be used for arterial puncture.
Contents lateral to medial are TAN: Tendon, Arterty, Nerve
To remember the contents of the cubital fossa, you can use the mnemonic Really Need Beer To Be At My Nicest.