Anatomy
As the biceps brachii tendon enters the forearm, the medial portion of the tendon sends off a slip medially. This slip fans out and attaches to the deep fascia of the medial forearm. The fanned out tendon is the aponeurousis.
Functions
It is one of the distal attachments of the biceps brachii muscle in the forearm.
Clinical
In 3% of the population, the ulnar nerve passes superiorly to the aponeurousis, leaving the nerve more susceptible to damage.
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