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16.9 Olfactory epithelium (schematic).

16.10 Fine structure of the dendritic bulb on the free surface of a neurosensory cell of the olfactory mucosa
(ruminant; x14,000).

tubules. These cellular processes (50–100 μm) are bathed aspect of the cell body and penetrates the basal lamina.
in a layer of thin mucus that is secreted in part by the Axons combine to form bundles of myelinated nerve fibres
supporting cells (see below), and to a greater extent by (fila olfactoria) that course to the lamina cribrosa of the
glands of the olfactory mucosa. Odoriferous chemicals ethmoid bone, terminating in the olfactory bulb at the
diffuse into the mucous layer and interact with chemo- olfactory glomerulus.
receptors on the ciliary membrane. The resulting action Supporting cells extend from the basal lamina to the
potential is transmitted across the perikaryon to the effer- epithelial surface. Numerous irregularly branching micro-
ent arm of the axon. The axon extends from the basal villi project from the surface of the cell. In the olfactory

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