Quick Facts
Origin: Costal cartilages of seventh to twelfth ribs, thoracolumbar fascia, iliac crest, and inguinal ligament.
Insertion: Linea alba, pubic crest, and pecten pubis.
Action: Compresses and provides structural support to adjacent abdominal structures.
Innervation: Anterior rami of seventh to twelfth thoracic nerves, iliohypogastric and ilioinguinal nerves.
Arterial Supply: Lower posterior intercostal, subcostal, superficial and deep circumflex iliac, and superior and inferior epigastric arteries.
Origin
The transversus abdominis muscle originates from the:
- internal aspects of the seventh to twelfth costal cartilages;
- thoracolumbar fascia;
- anterior two thirds of the iliac crest;
- lateral one third of the inguinal ligament.
Insertion
The fibers of the transversus abdominis muscle travel in anterior and medial directions around the abdomen and insert onto the:
- linea alba, via its broad aponeurosis;
- pubic crest;
- pecten pubis, via its inguinal falx.
Key Features & Anatomical Relations
The transversus abdominis muscle (or corset muscle) is one of the muscles of the abdomen. It is a broad, flat skeletal muscle. The muscle belly gives rise to a broad aponeurosis of transversus abdominis, which contributes to the formation of the posterior layer of the rectus sheath.
The transversus abdominis muscle is located:
- superficial to the transversalis fascia;
- deep to the internal abdominal oblique muscle;
- lateral to the rectus abdominis muscle.
The transversus abdominis contributes to the formation of the:
- anterolateral abdominal wall;
- inguinal canal.
Actions
The transversus abdominis muscle compresses and provides structural support to adjacent abdominal structures (Moore, Dalley and Agur, 2009).
List of Clinical Correlates
- Transversus abdominis plane (TAP) block
References
Moore, K. L., Dalley, A. F. and Agur, A. M. R. (2009) Clinically Oriented Anatomy. Lippincott Williams & Wilkins.
Actions
The transversus abdominis muscle compresses and provides structural support to adjacent abdominal structures (Moore, Dalley and Agur, 2009).
Learn more about this topic from other Elsevier products
Transversus Abdominis Muscle
the transversus abdominis muscle that arises from the inner surface of the lower six ribs, and runs circumferentially to terminate in the rectus sheath.
