Dictionary.net

Perforating.

A name given to different muscles, whose tendons pass through intervals between the fibres or tendons of other muscles; thence called perforated. See Flexor Longus Digitorum, &c. Under the name Perforating Arteries, are included, 1. In the hand- arterial branches, given off by the profound palmar arch, which traverse the muscles and interosseous spaces. 2. In the thigh-three or four arteries, furnished by the profunda, which pass through the openings of the abductor magnus. 3. In the foot-the anterior and superior branches of the plantar arch.

Any nerve or muscle perforating a part.