Flexor retinaculum

Last revised by Craig Hacking on 24 Aug 2021

The flexor retinaculum (also known as the transverse carpal ligament) is a rectangular-shaped fibrous band located at the ventral aspect of the wrist.

The flexor retinaculum encloses and forms the roof of the carpal tunnel. The ulna aspect of the flexor retinaculum forms the floor of Guyon's canal.

It has superficial and deep layers, which are separate on the radial aspect, containing the tendon of flexor carpi radialis.

  • radial aspect of the flexor retinaculum may be pierced by the median nerve 2

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Cases and figures

  • Figure 1: carpal tunnel diagram
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