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Prominent muscle belly of the transversus abdominis muscle in the upper third of the abdomen

Prominent muscle belly of the transversus abdominis muscle in the upper third of the abdomen
The internal oblique decussates into anterior and posterior lamellae before merging with the external oblique anteriorly and transversus abdominis posteriorly. The arrow marks the medial insertion point of the transversus abdominis to form the posterior rectus sheath.
EO: external oblique; IO: internal oblique; TA: transversus abdominis; RA: rectus abdominis.
Courtesy of Clayton C Petro, MD.
Graphic 131397 Version 1.0