Transversus abdominis
Transversus Abdominis
The Transversus Abdominis (pronounced: trans-ver-sus ab-do-min-is), also known as the transverse abdominal muscle, is a significant muscle within the abdominal wall.
Etymology
The term "Transversus Abdominis" is derived from Latin, where "transversus" means "running across" and "abdominis" refers to the abdomen. This name is given due to the muscle's horizontal orientation across the abdomen.
Anatomy
The Transversus Abdominis is the deepest (innermost) layer of the three flat muscles of the lateral abdominal wall. It originates from the lumbar fascia, the anterior two-thirds of the iliac crest, the lateral half of the inguinal ligament, and the inner surfaces of the lower six costal cartilages. It inserts into the xiphoid process, the linea alba, and the pubic symphysis.
Function
The primary function of the Transversus Abdominis is to stabilize the trunk and maintain internal abdominal pressure. It plays a crucial role in forced expiration, urination, defecation, and childbirth.
Related Terms
- Abdominal wall
- Lumbar fascia
- Iliac crest
- Inguinal ligament
- Costal cartilages
- Xiphoid process
- Linea alba
- Pubic symphysis
- Trunk (anatomy)
External links
- Medical encyclopedia article on Transversus abdominis
- Wikipedia's article - Transversus abdominis
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