GENERAL HISTOLOGY

Detailed explanation-1: -The surface of the body of an echinoderm, where the mouth is situated is called the oral surface, which is usually on the ventral side (bottom of animals like starfish), while the opposite surface is called the aboral surface, where the anus is situated.

Detailed explanation-2: -In the echinoderms there are two surfaces. One is the oral surface, where the mouth is and the tube feet project. The tube feet on the oral surface are limited to distinct regions called the ambulacral regions. The other surface is the aboral, which typically contains the anal opening of the digestive system.

Detailed explanation-3: -The top side of the sea star is called the aboral side, because it’s opposite the oral side.

Detailed explanation-4: -Aboral Surface Definition Aboral surface denotes parts that are situated opposite to or away from the mouth, (oral surface) especially in animals like echinoderms, where they lack a clear upper and a lower side.

Detailed explanation-5: -The mouth in starfish is present on the oral (lower, ventral) surface and anus is on aboral (upper, dorsal) surface respectively.