The bicipital aponeurosis (also known as lacertus fibrosus) is a broad aponeurosis of the biceps brachii, which is located in the cubital fossa of the elbow. It separates superficial from deep structures in much of the fossa.
Some individuals (about 3% of the population) have a superficial ulnar artery that runs superficially to the bicipital aponeurosis instead of underneath it. These individuals are at risk for accidental injury to the ulnar artery during venipuncture.[5]
Clinical significance
The bicipital aponeurosis is superficial to the brachial artery and the median nerve, but deep to the median cubital vein. This protection is important during venipuncture (taking blood).
It is one structure that has to be incised during fasciotomy in the treatment of acute compartment syndrome of the forearm and elbow region.