Opening of anal epithelium is made up of:

Ans. A. Squamous cella. The anal canal is divided into three parts. The zona columnar is the upper half of the canal and is lined by simple columnar epithelium. The lower half of the anal canal, below the pectinate line, is divided into two zones separated by Hilton's white line.b. The two parts are the zona hemorrhagica and zona cutanea, lined by stratified squamous non-keratinized and stratified squamous keratinized, respectively.