Transversus abdominis muscle
Musculus transversus abdominis
- Synonym: Transverse abdominal muscle
Definition
The transversus abdominis is the deepest muscle of the lateral abdominal wall. It is a flat, thin sheet of skeletal muscle that lies internal to the internal abdominal oblique and superficial to the peritoneum.
Origin: Eighth costal cartilage, last lumbar transverse process and tuber coxae.
Insertion: On the inner surface of the rectus abdominus.
Action: Compression and support of the abdominal viscera.
Nerve: Medial branches of the last few intercostales and costoabdominalis, iliohypogastricus and ilioinguinalis nerves.
Arterial Supply: Caudal intercostal arteries, lumbar arteries, deep circumflex iliac arter
References
Dyce KM, Sack WO, Wensing CJG. Textbook of Veterinary Anatomy. 5th ed. St. Louis: Elsevier; 2017.
König HE, Liebich HG. Veterinary Anatomy of Domestic Mammals: Textbook and Colour Atlas. 6th ed. Stuttgart: Schattauer; 2020.
Evans HE, de Lahunta A. Miller’s Anatomy of the Dog. 5th ed. St. Louis: Elsevier; 2020.
