The =olfactory region= lies above the lamina transversa, which separates
it from the naso-pharyngeal meatus. The mucous membrane is distinguished
by its thickness and yellow color, and is very extensive. It covers
about half of the large ethmoturbinals, and one-third to one-half of the
septum nasi. The ethmoturbinal which projects into the frontal sinus and
the adjacent inner wall of the sinus is olfactory in character.
Olfactory nerve-fibers ramify in the vomero-nasal organ (of Jacobson).
The gustatory apparatus presents no special features of importance.