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Special Senses

Special Senses. Sense of Smell and Taste. Receptor for these senses are chemoreceptors Senses closely related Four types of taste receptors Many types of smell receptors. Taste buds. Taste buds Receptors for taste Papaille Four Types 6 tastes Sweet, bitter, savory Salty, spicy, sour.

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Special Senses

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  1. Special Senses

  2. Sense of Smell and Taste • Receptor for these senses are chemoreceptors • Senses closely related • Four types of taste receptors • Many types of smell receptors

  3. Taste buds • Taste buds • Receptors for taste • Papaille • Four Types • 6 tastes • Sweet, bitter, savory • Salty, spicy, sour

  4. Which is not a type of taste sensation? • Spicy • Bitter • Rotten • Sour

  5. Olfactory Receptors • Olfactory receptors • Postage stamp area at top of nasal cavity • Olfactory receptor cells • Hairs bathed in mucosa • Olfactory filaments (olfactory nerve) • Stimulated by chemicals in mucus

  6. Sense of Hearing • Outer Ear • Pinna (auricle) • Outside of ear collects sound waves • External auditory canal • Tube from pinna to ear drum

  7. The mucosa in the nose is similar in function to the _______ of the eye. • Conjunctiva • Sclera • Tears • Cornea

  8. Sense of Hearing • Middle Ear (tympanic cavity) • Eardrum • Ossicles • Hammer transfers vibration to anvil • Anvil transfers vibration to stirrup • Strirrup transfers vibration to oval window • Oval Window • Sets fluid in inner ear into motion

  9. Sense of Hearing • Inner Ear • Bony labyrinth • Cochlea • Contains organ of Corti which contains hair cells • Vestibule • Semicircular canals

  10. Which of these is not an ossicle of the middle ear • Anvil • Pina • Stirrup • Hammer

  11. How Do We Hear • Anvil transmits wave to oval window • Tectorial membrane moves bending or tweaking the hairs in the organ of Corti • Hairs closer to oval window stimulated by high pitch • Hairs further down cochlea stimulated by low pitch • Hairs send pulses to brain through cochlear nerve

  12. Equilibrium • Sense of Balance • Depend on vestibule and semicircular canals • Responds to movements of our head • Two parts • Static and dynamic equilibrium

  13. Static Equilibrium • Maculae in vestibule report on changes in position when at rest • Help tell which way is up • Helps divers know which direction is surface

  14. Dynamic Equilibrium • Receptors are found in semicircular canals • Respond to angular or rotational disturbances • Receptors orientated in all three planes to sense any disturbance

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