Macroscopic view of split head of a juvenile alligator. A Lateral view. B Right half of the head showing the incurrent naris and the length of the nasal cavity. * A piece of the septum occludes the nasal cavity. OB – olfactory bulb, VB – vestibule. C Same view as in B depicting the 5 zones that were examined at the light microscopic and the electron microscopic level.