Transversus abdominis

Transversus abdominis (or transverse abdominal muscle, transversalis muscle and transversus abdominis muscle) is a muscle layer of the anterior and lateral (front and side) abdominal wall which is deep to (layered below) the internal oblique muscle. It is thought by most fitness instructors to be a significant component of the core.

Structure

The transversus abdominis, so named for the direction of its fibers, is the innermost (deepest) of the flat muscles of the abdomen, being located beneath the internal oblique muscle. It is thin and quadrilateral in form and is narrower and thinner than the internal oblique muscle and the external oblique muscle.

Origin and insertion

The transversus abdominis originates, as do the other two flat muscles, from the lumbar fascia, the anterior two-thirds of the iliac crest, and the lateral half of the inguinal ligament. The muscle ends anteriorly in a broad aponeurosis. The lower fibers of this aponeurosis end in a tendon which is curved to embrace the rectus abdominis.

Function

The transversus abdominis helps to compress the ribs and viscera, providing thoracic and pelvic stability. The body uses this muscle in almost every movement, because it is so important in stabilization. It does not move the spine, but it does stabilize it.

Clinical significance

The transversus abdominis is clinically relevant in pregnancy, labor, and childbirth. It is also relevant in the context of low back pain as it is a key stabilizer of the spine and helps to prevent injury.

See also

• Abdominal exercise
• Rectus abdominis muscle
• Internal oblique muscle
• External oblique muscle

Transversus abdominis Resources
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