What is the definition or description of: tram flap?

Abdomen Rectus Mus.: Tram flap stands for transverse rectus abdominus myocutaneous flap. It is most typically used for breast reconstruction and can be in the formed of an attached "pedicled" flap or in the form of a detached microvascular "free" flap, more commonly known as free tram or diep. Tram flaps can also be used to cover other difficult wounds in other areas of the body.

TRAM Flap: Transverse rectus abdominis myocutaneous flap is often utilized to reconstruct one or two breasts while also reducing the size of the patient's redundant abdominal tissue. The skin is cut with a horizontally oriented ellipse and remains attached to the lower end of the rectus abdominis muscle which is flipped up to carry blood supply to the skin which is used to reconstruct the breast.