Restoration of the intrinsic muscle function of the long fingers
The superficial insertions occur at three separate levels in the finger ( Figure 18.2 ): 8
1. One group of muscle bundles runs into the transverse fibers surrounding the posterior aspect of the MP joint and into the base of the proximal phalanx, and forms the interosseous hood. The angle of approach of the palmar interosseous at the MP level is greater than the angle of the dorsal interosseous. The interosseous muscles flex the MP joint by means of the interosseous hood.