Fig. 4
From: MRI anatomy of the rectum: key concepts important for rectal cancer staging and treatment planning
Sagittal T2-weighted MR image (a) demonstrating the normal anatomy of the anorectal junction (see also Fig. 2a) and the anal verge in a male individual without rectal cancer. Schematic coronal drawing (b) showing the anorectal junction and anal verge in relation to the dentate line (watershed junction between splanchnic and somatic innervation of the anorectum) and the anal margin, which are typically not very well appreciated on MRI