MICROANATOMY

Detailed explanation-1: -The olfactory nerve, also known as the first cranial nerve, cranial nerve I, or simply CN I, is a cranial nerve that contains sensory nerve fibers relating to the sense of smell. The afferent nerve fibers of the olfactory receptor neurons transmit nerve impulses about odors to the central nervous system (olfaction).

Detailed explanation-2: -The olfactory nerve carries impulses for the sense of smell.

Detailed explanation-3: -The olfactory nerve is the first cranial nerve and is instrumental in our sense of smell. The olfactory nerve contains only afferent sensory nerve fibers and, like all cranial nerves, is paired.

Detailed explanation-4: -Olfactory sense is, in terms of evolution, one of the oldest senses, allowing the organisms with receptors for the odorant to identify food, potential mating partners, dangers and enemies. For most living creatures and for mankind smell is one of the most important ways of interaction with the environment.

Detailed explanation-5: -Each olfactory neuron has about 106 receptor molecules on its cilia. Odors penetrate the mucus overlying the sensory epithelium and gain access to the receptors by virtue of their partition and diffusion coefficients in the olfactory mucus.