It is a strong, transverse, fibrous band that confines the flexor tendons of the five fingers, together with their synovial sheaths and the median nerve, to the arch of the carpus, which it converts into the carpal tunnel; also known as flexor retinaculum.
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O'Rahilly, Ronan, and Fabiola Muller. Basic Human Anatomy: A Regional Study of Human Structure. Saunders, 1983.