Anus (Anal Canal): Anatomy and Function
What is the anus? The anus, also called the anal canal, is the lowest end of the rectum. It is divided into three areas from top to bottom: Zona columnaris: the mucosa here has six to eight longitudinal anal columns with indentations in between. Beneath the mucosa lies a vascular cushion (corpus cavernosum recti), which, … Anus (Anal Canal): Anatomy and Function