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Taste. As shown to the right, each taste bud consists of a cluster of sensory cells forming synapses with neurons with long axons. These project to the medulla in one of three cranial nerves (VII,IX,X). The sensory cells release glutamate when stimulated by their corresponding taste.Scattered over the tongue, there are five classical types of taste buds: salt, sweet, sour, bitter, and umami. Salt and sweet are self-explanatory.The bitter respond to various plant alkaloids, sour to acid (such as might be found in spoiled foods), and the umami to glutamate and some related substances.aste. As shown to the right, each taste bud consists of a cluster of sensory cells forming synapses with neurons with long axons. These project to the medulla in one of three cranial nerves (VII,IX,X). The sensory cells release glutamate when stimulated by their corresponding taste.
The gustatory (taste) cells, a chemoreceptor, occupy the central portion of the bud; they are spindle-shaped, and each possesses a large spherical nucleus near the middle of the cell. The peripheral end of the cell terminates at the gustatory pore in a fine hair filament, the gustatory hair.aste buds are only present in circumvalate, fungiform, and foliate papillae and soft palate, but not filiform papillae. Salts, sweet, sour and umami tastes causes depolarization of the taste cells, although different mechanisms are applied. Bitter causes an internal release of Ca 2+ , no external Ca 2+ is required.