THE GUSTATORY SYSTEM Description The gustatory system is a highly specialized system for reception and processing of the sense of taste. It consists of: The taste buds, which are the peripheral receptors of taste stimuli The gustatory pathway for transmission of gustatory impulse and
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The gustatory system is a highly specialized system for reception and processing of the sense of taste. It consists of:
The taste buds, which are the peripheral receptors of taste stimuli
The gustatory pathway for transmission of gustatory impulse and
The cortical centers implicated in gustatory functions.
Distribution: Taste buds are located in the following areas:
Taste Pore: This is a pit-like depression in the center of the apical aspect of the bud, which receives glandular secretion required for dissolving materials to be tasted.
The peripheral processes of these neurons are distributed to the taste buds in the areas already identified.
This is the highly specialized system adapted for
the reception and processing of the sense of
It is composed of:
1. Olfactory neurosensory cells (Primary olfactory neurons):
2. Pigmented supportive sustentacular cells: These cells possess yellowish pigment, which impacts a yellowish color on the epithelium.
3. Bowman’s glands: These are branched tubular glands, which secrete a lysozyme, and a glycoprotein mucous fluid, which dissolves the odoriferous substance. The mucus contains odorand-binding proteins.
4. Basal cells: These are undifferentiated cells located at the basal aspect of the epithelium and have the capability of replenishing all the cell types in the epithelium.
5. Sensory endings of the trigeminal nerve for perception of noxious sensations
There are two primary olfactory areas in the
brain,located in the temporal lobe.
The two areas are:
Fibers of this tract converge on the olfactory trigone from where they diverge to pass into the lateral and intermediate olfactory striae.