- Extensor retinaculum: thickened band of deep fascia on the back of the wrist, directed downward and laterally, about 2 cm broad vertically.
Attachments
- Medial end: styloid process of the ulna, triquetral and pisiform bones.
- Lateral end: lower part of the anterior border of the radius.
extensor retinaculum of the wrist, dorsal view Extensor retinaculum of the wrist, dorsal view.
Compartments
- Five septa run from the retinaculum to the dorsal radius and ulna, dividing the space deep to it into six compartments, numbered I to VI lateral to medial.