all senses. The tongue is provided with many small projections called papillae which give the tongue an abrasive feel. Taste buds are located mainly on the papillae which are scattered over the entire tongue surface. Most taste buds are seen on the tongue (Figure .
) few are scattered on the soft palate, inner surface of the cheeks, pharynx and epiglottis of the larynx. Taste buds are flask-shaped and consist of – epithelial cells of two major types. Gustatory epithelial cells (taste cells) and Basal epithelial cells (Repairing cells ) Long microvilli called gustatory hairs project from the tip of the gustatory cells and extends through a taste pore to the surface of the epithelium where they are bathed by saliva. Gustatory hairs are the sensitive portion of the gustatory cells and they have sensory dendrites which send the signal to the brain.
The basal cells that act as stem cells, divide and differentiate into new gustatory cells (Figure . ). Skin-Sense of Touch Skin is the sensory organ of touch and is also the largest sense organ. This (SLJORWWLV 3DODWLQH WRQVLO /LQJXDO WRQVLO )XQJLIRUP SDSLOODH D 7DVWHEXGVDVVRFLDWHG ZLWKIXQJLIRUPDQGYDOODWH SDSLOODH E (QODUJHGVHFWLRQRI DYDOODWHSDSLOOD 7DVWHEXG 9DOODWH SDSLOODH &RQQHFWLYH WLVVXH 7DVWHILEHUV RIFUDQLDO QHUYH WH DH &RQQHFWLYH WLVVXH 7DVWHILEHUV RIFUDQLDO QHUYH *XVWDWRU\ KDLUV 6WUDWLILHG VTXDPRXV HSLWKHOLXP RIWRQJXH %DVDO HSLWKHOLDO FHOOV *XVWDWRU\ HSLWKHOLDO FHOOV 7DVWH SRUH The taste bud cells are subjected to huge amounts of friction, because of their location and are routinely burned by hot foods.
These are the most dynamic cells in the body and are replaced every seven to ten days. Figure . Gustatory receptor Figure . Skin receptors XI Std Biology-Zoology Chapter-