Extensor retinaculum
The extensor retinaculum is a band-like structure on the dorsal side ( dorsal ) near to the body ( proximal ) part of the wrist . It contains in six subjects, the tendons of the extensor muscles ( extensors ) of the hand , along with their tendon sheaths . It represents the counterpart of the flexor retinaculum on the inside of the hand ( palmar ).
Its function consists mainly in the movable fixation of the tendons of the extensor muscles. This prevents the tendons from lifting up - similar to a tense bow - during extension.
From radial (towards the spoke ) to ulnar (towards the ulna ) the boxes and tendons are as follows:
- 1. Box: abductor pollicis longus , extensor pollicis brevis
- 2. Expert: extensor carpi radialis longus , extensor carpi radialis brevis
- 3rd compartment: extensor pollicis longus muscle
- 4th compartment: extensor digitorum muscle , extensor indicis muscle
- 5th compartment: extensor digiti minimi muscle
- 6th compartment: extensor carpi ulnaris muscle