Fig. 2.

First (black arrowhead) and second (white arrowhead) extensor compartments are indicated on the dorsoradial aspect of this cadaver dissection. Note the 1,2-ICSRA overlying the extensor retinaculum between these two compartments. Adapted from Waitayawinyu et al. [95]. Permission for use courtesy of the American Society for Surgery of the Hand, http://www.assh.org