The gustatory system is the sensory system that provides the perception and analysis of chemicals that irritate the chemoreceptors of the oral cavity

Gustatory system structure

The gustatory system is the sensory system that provides the perception and analysis of chemicals that irritate the chemoreceptors of the oral cavity.

Gustatory system consists of a peripheral (taste buds), conductor (glossopharyngeal nerve) and central (the medulla oblongata, hypothalamus, thalamus, temporal cortex) parts. Taken from http://worldofschool.org

Taste buds, along with the olfactory receptors, are chemoreceptors. Taste receptors are included in the gustatory bulbs, housed in the mouth, most of all — in the tongue. Taste buds are located on it unevenly, in groups of 10 to 300 cells: more sensitive to sweet substances — at the tip, to acid — at the edges, to bitter — at the root, and to salt — at the tip and edges. Each of the 10000 taste buds consists of 2-6 receptor cells that have the supporting cells between them. Gustatory bulb does not reach the surface of the tongue mucous membrane and is connected with the oral cavity with porus gustatorius. Gustatory bulbs have a short life period as compared with other receptors (240 hours), after that time they die and are replaced by new ones. The outer side of taste receptor is in contact with the food, and the other end is placed in the thickness of tongue and connected with the sensitive nerve fibers.

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Questions:
  • Determine the relationship of gustatory system structure and functions.

  • What is the difference between taste buds and receptors of other sensory systems?