Ultrasound of the fourth extensor compartment of the wrist
Ultrasound of the fourth extensor compartment of the wrist
The extensor digitorum and the extensor indicis of the fourth extensor compartment (IV) are shown in this ultrasound image, along with the ECRL, ECRB, and EPL. The image was obtained with an ultrasound probe placed at the site of the red mark in the photograph.