Transverse Abdominis
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The deepest abdominal muscle; compresses the abdomen, supports the abdominal contents, and aids lower-back stability.
Detail
The transverse abdominis is helpful for compressing the other abdominal muscles (during heavy breathing). It helps support the abdominal contents and prevents bulging of the abdomen. Together with the internal oblique (the inner abdominal muscles), it stabilizes the lower back: the greater the tone in these inner abdominal muscles, the greater the stability in the lower back, because they fix the thoracolumbar fascia.
Key facts
- Compresses the other abdominal muscles (during heavy breathing).
- Supports abdominal contents; prevents abdominal bulging.
- With the internal oblique, stabilizes the lower back via the thoracolumbar fascia.
Connections
- Abdominals (Midsection) — group it belongs to.
- Internal Oblique — co-stabilizes the lower back.
- Erector Spinae (Sacrospinalis) — fascia link to lower-back muscles.
- Abdominal Work — Common Misconceptions (Gym & Class Setting) — the "only tummy-thinning effect" and "sit-ups strengthen the back" myths this muscle's function explains.
Sources
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Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.