Flexor retinaculum of the hand
The flexor retinaculum of the hand is a fibrous band that is strong and extends over the carpus. The carpus is defined as the only cluster of bones located in the wrist between the ulna, the radius and the metacarpus. Once this band arches, it coverts the deep groove into a tunnel that is located on the front of the carpal bones. This tunnel is called carpal tunnel and is the location where the median nerve and the flexor tendons pass through. The flexor retinaculum of the hand is connected through the middle of the pisiform, which is a small wrist bone that is shaped like a pea, and the hamate bone's hamulus, which is a curved process that is located on the underside of the hamate bone. It also connects laterally to the scaphoid and across the middle of the trapezium. The flexor retinaculum of the hand extends continuously along with the carpal ligament of the volar, which is the thick portion located at the anterior of the wrist, as well as the palmar aponeurosis, which controls the muscles in the palm.
Written and medically reviewed by the Healthline Editorial Team
In Depth: Flexor retinaculum of the hand