Bicipital aponeurosis
Aponeurosis bicipitalis
- Latin synonym: Aponeurosis musculi bicipitis brachii; Lacertus fibrosus
- Eponym: Pirogoff's aponeurosis
- Related terms: Bicipital aponeurosis; Lacertus fibrosus
Definition
The bicipital aponeurosis (also known as the lacertus fibrosus) is a broad, flat, tendinous expansion that arises from the distal part of the biceps brachii muscle, primarily from the medial aspect of the short head, though fibers from the long head may also contribute. Structurally, it fans out medially and distally across the antecubital fossa, blending with the deep fascia of the forearm overlying the flexor muscles.
As the bicipital aponeurosis moves across the cubital fossa, it passes superficial to the brachial artery and the median nerve, providing a protective layer for these neurovascular structures as they traverse the cubital fossa.
References
Balaban M, Torun Bİ. Anatomical considerations and clinical implications of bicipital aponeurosis: A magnetic resonance imaging study. Clin Anat. 2023 Apr;36(3):344-349.
