Smell and Taste Chemoreceptors

Olfactory receptors

More sensitive and have a wider range of chemical sensations compared to taste receptors

Olfactory Epithelium

Organ of smell, 5 sq cm area in the roof of nasal cavity

Supporting Cells

Non-sensory cells surrounding olfactory receptor cells

Olfactory Receptor Cells

Bipolar neurons in the olfactory epithelium

Olfactory Cilia

Hair-like extensions from olfactory receptor cells

Taste Buds

Receptors for taste, widely distributed, mostly on the tongue

Gustatory Taste Cells

One type of modified epithelial cells in taste buds

Supporting Cells

Another type of modified epithelial cells in taste buds

Gustatory Hairs

Microvilli of taste receptor cells sending messages to the brain

Cranial Nerves

VII, IX, and X transmitting taste signals to the brain

Chemoreceptors

Receptors for olfaction and taste, respond to chemicals in solution

Sense of smell

The least understood special sense

Papillae

Structures on the tongue with 3 types: filiform, fungiform, circumvallate

Taste Pore

Opening in the epithelial surface of a taste bud