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.