Its hind-end elongates till it comes into connection with, and opens into, the cloacal section of the hindgut.
The hindgut is that portion of the intestine from the stomach to the end of the body.
In the Cyclostomata there is no differentiation between the mid- and hindgut.
The hindgut, separated from the preceding by a constriction, is very short and of large caliber.
The region of the hindgut, at this stage, is about one-fifth of the entire length of the embryo.
Figure 4M passes through the region where both the allantois and the Wolffian ducts open into the hindgut.
hindgut hind·gut (hīnd'gŭt')
The large intestine, rectum, and anal canal.
The caudal or terminal part of the embryonic gut.