To determine whether the innervation of taste buds changes during postnatal development, the number of geniculate ganglion cells that innervated single fungiform taste buds were quantified in the tip- and midregions of the tongue of adult and developing rats. There was substantial variation in both the size of individual taste buds and number of geniculate ganglion cells that innervated them. I...

Page 219 Fish possess three types of olfactory sensory neurons, i.e., ciliated, microvillous, and crypt neurons, distributed throughout a single sensory epithelium. The former two cell populations are also present in mammals where they occur in various segregated olfactory subsystems. Whereas the ciliated neurons express odorant or trace amine-associated receptor genes, the microvillous neurons...

In recent years electron microscopists have reported small intracytoplasmic granules in epi-thelial cells of m a m m a l i a n skin and oral mucosa (4, 6, 8, 10-12, 15, 16). These granules are usually described as small (0.1 to 0.2 micron in diameter), rod-shaped or spherical, m e m b r a n e-b o u n d e d bodies, usually containing electron-opaque material and sometimes (4, 8, 10) showing inte...