• OLFACTORY RECEPTORS
• Olfactory receptor cells are bipolar neurons whose cell
bodies lie within the olfactory mucosa that lines the
cribriform plate, a bone at the base of the rostral part of
the brain.
• Olfactory receptor cells send a process toward the
surface of the mucosa, which divides into 00 to 00 cilia
that penetrate the layer of mucus.
• The olfactory mucosa also contains free nerve endings
of trigeminal nerve axons; these nerve endings
presumably mediate sensations of pain that can be
produced by sniffing some irritating chemicals, such as
ammonia