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21 Cards in this Set
- Front
- Back
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cornea |
gathers and focuses incoming light |
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retina |
contains photoreceptors that transduce light into electrical signals |
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sclera |
white of the eye |
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iris |
colored part dilator pupillae- opens pupil under sympathetic stimulation constrictor pupillae- constricts pupil under parasympathetic |
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ciliary body |
produces acqueous humor, drained by canal of schlemm |
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path of light |
cornea to pupil to lens to vitreous to retina (rods and cones) to bipolar cells to ganglion cells to optic nerve to optic chiasm to optic tract to LGH of thalamus, then radiation through parietal and temporal to occipital lobe |
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pinna |
outer ear- channels sound waves into external auditory canal, then passes through tympanic membrane |
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ossicles |
tiny bones transmit and amplify vibrations from tympanic membrane to inner ear rests in oval window of cochlea malleus-hammer incus-anvil stapes- stirrup |
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eustacian tube |
connects nasal cavity to equalize pressure |
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bony labyrinth |
cochlea, vestibule, semicircular canals filled with membranous labyrinth which is bathed in K+ rich endolymph and suspended in perilymph |
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cochlea |
consists of 3 scalae |
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organ of Corti |
made up of thousands of hair cells bathed in endolymph actual hearing apparatus within cochlea convert physical stimulus to electrical signal which is carried to CNS by auditory vestibulocochlear nerve |
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vestibule |
portion of bony labyrinth that contains the utricle and saccule contains hair cells that resist motion and bend |
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semicircular canal |
detect circular motion |
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hair cell mechanism |
stereocilia sway, opening ion channels, which create a receptor potential |
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Pacinian corpuscles |
detects deep pressure, vibration |
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Meissner corpuscles |
respond to light touch |
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Merkle cells/disks |
respond to deep pressure, texture |
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Ruffini endings |
respond to stretch |
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Free nerve endings |
respond to pain, temp |
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gate theory of pain |
spinal cord preferentially forwards signals from other modalities, reducing pain |
