ex 26 Olfaction and Taste
Terms
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- chemoreceptors
- the receptors for olfaction and taste- respond to chemicals in a solution
- olfactory epithelium
- the organ of smell- occupies an area of about 5 cm in the roof of the nasal cavity
- supporting cells
- non-sensory epithelial cells thatsurround the specialized receptor cells in the olfactory epithelium
- olfactory receptor cells
- bipolar neurons whose olfactory cilia extend outward from the epithelium.
- taste buds
- specific receptors for the sense of taste- not uniformly dist. in the oral cavity- most in papillae- few on the soft palate, epiglottis, pharynx, and inner surface of the cheeks
- papillae
- peglike projections of the mucosa on the dorsal surface of the tongue where most taste buds are located
- circumvallate papillae
- where tasts buds are primarily; the sides of them; they are round arrange in a V on the posterior surface of the tongue
- foliate papillae
- side wall tast buds slanted
- each tast bud consists largely of a globular arrangemetn of 2 tpes of modified epithelial cells:
- gustatory cells and basal cells
- gustatory cells
- the actual receptor cells of the taste bud
- taste pore
- an opening in the epithelial surface through which the gustatory hairs of the receptor cells penetrate
- gustatory hairs
- long microvilli of the receptor cells that go thru the taste pore and contact specific chems in the solution so that the tast cells depolarize
- The afferent fibers from the taste buds to the sensory cortex in the postecentral gyrus of the brain are carried in 3 cranial nerves:
- Facial (VII) Glossopharyngeal (IX) Vagus (X)