flap constructed of the deep muscle fascia with its overlying skin, and based on fasciocutaneous perforators arising from regional arteries and passing along fascial septa between adjacent muscles. The vascular anastomoses among the fasciocutaneous perforators within the deep fascial plexus are axial, therefore enabling a greater length:width ratio in the fasciocutaneous flap than in the random pattern skin flap. See also: musculocutaneous flap.