GROSS ANATOMY

Detailed explanation-1: -Your olfactory nerve is the first cranial nerve (CN I). This nerve enables your olfactory system and sense of smell. Many conditions can affect cranial nerve 1, including COVID-19, diabetes and Alzheimer’s.

Detailed explanation-2: -Each of these small nerve bundles forms the olfactory nerves, and there are around 15 to 20 of them on each side of the nasal cavity.

Detailed explanation-3: -The trigeminal nerve has receptors for pungent odorants throughout the nasal and pharyngeal cavities. The glossopharyngeal and vagus nerves provide the minor chemosensory function in the pharyngeal area. The ciliated olfactory receptors are part of the olfactory neuroepithelium.

Detailed explanation-4: -Integration areas of olfactory sensations are extensive, including the olfactory cortex and the olfactory tubercle, some parts of cerebral tonsils, certain hypothalamic areas, medio–dorsal thalamus and medial and lateral orbito–frontal cortex [7].

Detailed explanation-5: -The cranial nerves are considered components of the peripheral nervous system (PNS), although on a structural level the olfactory, optic and terminal nerves are more accurately considered part of the central nervous system (CNS). The 12 pairs of cranial nerves are special nerves associated with the brain.