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1st order neuron (PNS)
sensory fibers carry TO spinal cord/brainstem
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2nd order neuron (CNS)
sensory fibers carry impulses UP spinal cord/brainstem to thalamus
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3rd order neuron (CNS)
sensory fibers carry impulses FROM thalamus to appropriate lobe of cerebrum
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sensory adaption
at first very easily stimulated then gets used to it
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General receptors
- throughout body
- skin, muscles, organs etc
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Special receptors
in complex organs located in head (vision)
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Vision
- 70% of recptors in here(most complex organ)
- uses photoreceptors
- -cones-color
- -rodes-black/white
- impulses sent to occipital lobe
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fibrous tunic
- cornea-window
- sclera-white
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vascular tunic
- choroid-absorbs light
- iris-adjusts light
- lens-focuses image on retina
- ciliary body-adjust shape of lens
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nervous tunic AKA retina
- conatins photoreceptors
- optic disc-blind spot
- fovea-focal point
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glaucoma
- disease of eye due to intraocular pressure
- fluid in eye
- damages optic nerve/retina
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hearing
- pinna
- external auditory canal
- tympanic membrane
- cochlea
- semicircular canal/vestibule
- malious
- incus
- stapes
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ceruminous glands
makes wax
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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
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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
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smell
- chemoreceptors(dissolves in mucus memebrane)
- 10-20 million receptors
- reduce with age
- impulse sent to temporal lobe
- do not synapse in thalamus
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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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