How many tunnels does the extensor retinaculum contain?

The extensor retinaculum is a fibrous band located on the posterior aspect of the wrist, and its main function is to hold the extensor tendons in place as they pass from the forearm to the hand. It creates distinct compartments that contain these tendons and their synovial sheaths.

There are six tunnels within the extensor retinaculum, which correspond to the extensor tendon compartments. Each compartment is associated with specific extensor muscles responsible for extending fingers and the wrist. These six tunnels allow for smooth and organized movement of the tendons, reducing friction and preventing bowstringing.

The anatomical significance of these tunnels is essential for understanding wrist mechanics and tendon function, particularly in surgical procedures and evaluating injuries related to the extensor tendons.