sensory

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Author:
eli
ID:
148431
Filename:
sensory
Updated:
2012-04-18 20:40:27
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sensory
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Description:
sensory
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  1. 1st order neuron (PNS)
    sensory fibers carry TO spinal cord/brainstem
  2. 2nd order neuron (CNS)
    sensory fibers carry impulses UP spinal cord/brainstem to thalamus
  3. 3rd order neuron (CNS)
    sensory fibers carry impulses FROM thalamus to appropriate lobe of cerebrum
  4. sensory adaption
    at first very easily stimulated then gets used to it
  5. General receptors
    • throughout body
    • skin, muscles, organs etc
  6. Special receptors
    in complex organs located in head (vision)
  7. Vision
    • 70% of recptors in here(most complex organ)
    • uses photoreceptors
    • -cones-color
    • -rodes-black/white
    • impulses sent to occipital lobe
  8. 3 layers of eye
    • fibrous
    • vascular
    • nervous
  9. fibrous tunic
    • cornea-window
    • sclera-white
  10. vascular tunic
    • choroid-absorbs light
    • iris-adjusts light
    • lens-focuses image on retina
    • ciliary body-adjust shape of lens
  11. nervous tunic AKA retina
    • conatins photoreceptors
    • optic disc-blind spot
    • fovea-focal point
  12. glaucoma
    • disease of eye due to intraocular pressure
    • fluid in eye
    • damages optic nerve/retina
  13. hearing
    • pinna
    • external auditory canal
    • tympanic membrane
    • cochlea
    • semicircular canal/vestibule
    • malious
    • incus
    • stapes
  14. ceruminous glands
    makes wax
  15. hearing/equilibrium
    • hearing
    • -mechanoreceptors in cochlea
    • -vibrations transmitted from
    • *outter ear(eardrum)>middle ear bones>fluid in ears>bend receptors in cochlea
    • -impulse sent to temporal lobe
  16. hearing/equilibrium
    • equilibrium
    • -mechanoreceptors in semicircular canal/ vestibule
    • -fluid moves w/in inner ear due to head or body position
    • -impulse sent to cerebellum and sent to cerebrum
  17. smell
    • chemoreceptors(dissolves in mucus memebrane)
    • 10-20 million receptors
    • reduce with age
    • impulse sent to temporal lobe
    • do not synapse in thalamus
  18. taste
    • *chemoreceptors(dissolve in tonge papillae, cheeks, palate, throat, larynx)
    • *10,000 receptors >3000 in adults
    • *3 diff cranial nerves detect taste
    • *worksw smell to detect taste
    • *impulse sent to parietal lobe

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