Smell Physiology

This YouTube video below will go into more depth about the Anatomy & Physiology of smell.

It will also explain the pathways of smell, the different function, and the different pathways, as we explained blow.

Located in the nasal passage are over 40 million receptors. A small area of this is

mucous membranes that lines the nose which is called olfactory nerve. Cilia (hairlike projections)

they ditect the order. The cilia triggers nerve impulses which go through the nasal

passage.As these odors reach the receptors by making contact by diffusing and making contact physically with the receptors.

These impulses travel through olfactory bulbs and along the olfactory nerves, up into the brain and then the brain

then inturpets the impulses into its distinct smell. After reaching the temporal lobe of the brain, following the

stimulation of a receptor, the odor molecule is rapidly destroyed and the stimulation ends.

Above is an olfactory transduction. This picture tells you when the olfactory transduction starts and

when it ends. As this process proceeds it activates G protein, then activates enzymes (adenylate cyclases).

Synthesize cyclic AMP as a second messenger. AMP acts directly on the plasma membrane

causing channels for Na+ and Ca2+ to open and they are able the enter.

Title: Human Anatomy & Physiology
Page: 570- 571
Publisher: Elaine N. Marieb
Katja Hoehn
Copyright 2010 Pearson Education, Inc

Smell Anatomy