Olfactory Nerve. Dr. Nimir Dr. Safaa. Objectives Describe the formation of the olfactory nerve. Discuss the olfactory pathway. Olfactory Nerves (Cranial Nerve I): It arise from the olfactory receptor nerve cells in olfactory mucous membrane in upper part of nasal cavity.
From peripheral process short cilia arise(olfactory hairs) which project into mucus covering mucous membrane. These cilia react to odors in air and stimulate the olfactory cells.
At anterior perforated substance the tract divides into medial and lateral olfactory striae.
Periamygdaloid and prepiriform areas are known as primary olfactory cortex.
In contrast to all other sensory pathways olfactory pathway has only two neurons and reaches cerebral cortex without synapsing in thalamus.