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38 terms

Special Senses

Lab session 10: SG11: Vision, hearing and equilibrium, olfaction and taste
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optic tract
contains fibers from both eyes, some have crossed from optic chiasma and some have not
lateral rectus
moves eye laterally; CN 6 - abducens
medial rectus
moves eye medially; CN 3 - oculomotor
superior rectus
elevates eye and turns it medially; CN 3 - oculomotor
inferior rectus
depresses eye and turns it medially; CN 3 - oculomotor
inferior oblique
elevates eye and turns it laterally; CN 3 - oculomotor
superior oblique
depresses eye and turns it laterally; CN 4 - trochlear
interdependence of taste and smell
what is tasted is actually smelled because chemoreceptors in both the nose and mouth are stimulated
emmetropic
normal vision
myopic
nearsighted
hyperopic
farsighted
ceruminous glands
wax secreting glands
oval window
transmits vibration of eadrums to fluids of inner ear
osseous labyrinth
bony chambers in inner ear
perilymph
aqueous fluid in osseous labyrinth
membranous labyrinth
follows contours of osseous labyrinth
endolymph
viscous fluid in membranous labyrinth
vestibular apparatus
consists of utricle and saccule
cochlear duct
separates cochlear cavity into upper and lower chambers
scala vestibule
upper chamber in cochlear duct; vestibular duct
scala tympani
lower chamber in cochlear duct; tympanic duct
round window
a membrane that bounds the scala tympani
spiral organ of corti
contains receptors for hearing
mechanism of dynamic equilibrium
involves the semicircular canals, which are oriented in three planes; horizontal, frontal, and sagittal
ampulla
an enlarged region at the base of each semicircular duct
crista ampullaris
a receptor region that consists of a tuft of hair cells covered with a cupula
cupula
a gelatinous cap on the crista ampullaris
mechanism of static equilibrium
located in the vestibule; provides information on which way is up or down, and linear and straightforward changes in speed
maculae
sensory receptors that occur in the utricle and saccule of the inner ear
hair cells
cells of maculae that are sensitive to linear movements
olfactory supporting cells
non-sensory epithelial cells that surround specialized receptor cells in the olfactory epithelium
olfactory receptor cells
bipolar neurons whose olfactory cilia extend outward from the epithelium
olfactory cilia
located on olfactory receptor cells and extend outward
taste buds
receptors for sense of taste; located on top of fungiforms and sides of circumvallate papillae
gustatory cells
neuroepithelial cells located in the taste bud and are the actual receptor cells for taste
basal cells
another type of epithelial gustatory cell
papillae
three types: foliate papillae, fugiform papillae and circumvallate papillae
suspensory ligament of eye
connect ciliary body to the eye's lens