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Inspiration is due to the contraction of the diaphragm and external intercostal muscles.
transversus abdominis
The transversus abdominis is the deepest.
-external oblique -internal oblique -transversus abdominis -rectus abdominis
Inferiorly, the medial portion of the fused internal oblique and transversus aponeuroses ... The fascia on the internal surface of the transversus abdominis serves as ... fascia separates the rectus abdominis muscle from the parietal peritoneum.