The Transversus abdominis, Rectus abdominis, and Pyramidalis. It is thought by most fitness instructors to be a significant component of the core. The transverse abdominal, so called for the direction of its fibers, is the innermost of the flat muscles of the abdomen, being placed immediately beneath the abdominal core strengthening exercises pdf oblique muscle.
The transverse abdominal arises as fleshy fibers, from the lateral third of the inguinal ligament, from the anterior three-fourths of the inner lip of the iliac crest, from the inner surfaces of the cartilages of the lower six ribs, interdigitating with the diaphragm, and from the thoracolumbar fascia. In layman’s terms, the muscle ends in the middle line of a person’s abdomen. The transverse abdominal helps to compress the ribs and viscera, providing thoracic and pelvic stability.