Muscle
Transversus abdominis
Deepest flat abdominal muscle
High-yield
Transverse fibres act as a "corset"; core-stability muscle. Contributes to the conjoint tendon.
Overview
The deepest flat abdominal muscle with transverse fibres that compress and support the abdominal viscera like a corset.
Reference facts
- Origin
- Thoracolumbar fascia, iliac crest, lateral inguinal ligament, and costal cartilages 7-12
- Insertion
- Linea alba, pubic crest, and pectineal line (conjoint tendon)
- Action
- Compresses and supports the abdominal viscera; increases intra-abdominal pressure
- Innervation
- Thoracoabdominal nerves (T7-T12), subcostal, and L1
- Blood supply
- Lower posterior intercostal / deep circumflex iliac arteries
Frequently asked questions
What does the transversus abdominis do?
The transversus abdominis compresses and supports the abdominal viscera; increases intra-abdominal pressure.
What nerve innervates the transversus abdominis?
The transversus abdominis is innervated by the thoracoabdominal nerves (T7-T12), subcostal, and L1.
Where does the transversus abdominis attach?
The transversus abdominis originates from the thoracolumbar fascia, iliac crest, lateral inguinal ligament, and costal cartilages 7-12 and inserts on the linea alba, pubic crest, and pectineal line (conjoint tendon).
What is the blood supply of the transversus abdominis?
The transversus abdominis is supplied by the lower posterior intercostal / deep circumflex iliac arteries.