Transversus Abdominis
Musculus transversus abdominis
The transversus abdominis is the deepest of the abdominal muscles, with horizontal fibers wrapping the trunk like a corset. Rather than moving the spine, it compresses the abdominal contents and generates intra-abdominal pressure, making it a primary spinal stabilizer that co-contracts with the diaphragm, pelvic floor, and multifidus. It is targeted by bracing drills, vacuums, dead bugs, and planks, and proper TVA activation underpins safe bracing during squats and deadlifts.
- Actions
- Compresses abdominal viscera, Increases intra-abdominal pressure, Spinal stabilization, Forced expiration, Supports the abdominal wall
- Origin
- Internal surfaces of costal cartilages of ribs 7-12, thoracolumbar fascia, anterior two-thirds of the iliac crest, and lateral third of the inguinal ligament
- Insertion
- Linea alba (via aponeurosis), pubic crest, and pecten pubis (via conjoint tendon)
- Innervation
- Thoracoabdominal nerves (T6-T11), subcostal nerve (T12), iliohypogastric and ilioinguinal nerves (L1)
- Blood supply
- Lower posterior intercostal, subcostal, and deep circumflex iliac arteries
Exercises (9)
Trains as a primary mover
Assists in