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50 terms

Special senses Lab quiz 2

STUDY
PLAY
Conjunctiva
Mucus
Tarsal Glands
Oil
Lacrimal Glands
Salt solution
What is a sty?
An infection of the sebaceous gland of the eyelid.
What is conjunctivitis?
Inflammation of the conjunctiva characterized by redness, itching, & often accompanied by a discharge.
Suspensory Ligamnet:
attaches the lens to the ciliary body
Aqueous humor:
fluid filling the anterior segment of the eye
Optic disc:
the blind spot
Iris:
contains muscle that controls the size of the pupil
Canal of Schlemm:
drains the aqueous humor from the eye
Retina:
"sensory" tunic
Vitreous humor:
substance occupying the posterior segment of the eyeball
Choroid:
forms most of the pigmented vascular tunic
Fovea Centralis:
tiny pit in the macula lutea; contains only cones
Lens:
important light-bending structure of the eye; shape can be modified
Cornea:
anterior transparent part of the fibrous tunic
Sclera:
composed of touch, white, opaque, fibrous connective tissue
Describe the appearance of the retina:
a delicate white, probably crumpled, membrane that separates easily from the pigmented choroid
At what point is the retina attached to the posterior aspect of the eyeball:
the optic disc
Explain why the part of the image hitting the blind spot is not seen:
there are no rods or cones
Refraction:
light bending
Accommodation:
ability to focus for close (under 20 ft) vision
Emmetropia:
normal vision
Hyperopia:
inability to focus well on close objects (farsightedness)
Myopia:
nearsightedness
Astigmatism:
blurred vision due to unequal curvatures of the lens or cornea
Convergence:
medial movement of the eyes during focusing on close objects
Collectively called the ossicles:
avnil (incus), hammer (malleus), pinna
Ear structures involved with balance:
semicircular canals, vestibule
Transmits sound vibrations to the ossicles:
tympanic membrane
Three circular passages, each in a different plane of space:
auditory tube
Transmits the vibratory motion of the stirrup to the fluid in the inner ear:
oval window
Passage between the throat and the tympanic cavity:
auditory tube
Fluid contained within the membranous labyrinth:
endolymph
Contains the organ of Corti:
cochlear duct
sites of the maculae:
saccule, utricle
Hair cells of organ of Corti rest on this membrane:
basilar membrane
Gel-like membrane overlying the hair cells of the organ of Corti:
tectorial membrane
Contains the cristae ampullaris:
ampulla
Function in static equilibrium:
otoliths, saccule, utricle, semicircular ducts
Function in dynamic equilibrium:
ampulla, cupula, saccule, utricle
Carries auditory information to the brain:
cochlear duct
Gelatinous cap overlying hair cells of the crista ampullaris:
cupula
Grains of calcium carbonate in the maculae:
otolliths
Nystagmus:
the involuntary rolling of the eyes in any direction of the trailing of the eyes slowly in one direction, followed by rapid movement in opposite direction
What is the usual reason for conducting the Romber test?
to determine of proprioceptive impulses are being transmitted up the spinal cord to the brain properly
Normal balance, or equilibrium, depends on input from a number of sensory receptors. Name them.
vestibular, visual, somatic receptors
Name 3 sites where receptors for taste are found, and circle the predominant site:
soft palate epiglottis, pharynx inner surface of cheeks, & papillae(predominant)
Describe the cellular makeup & arrangement of a taste bud:
taste buds consist of both gustatory cells & basal cells & are located deep between circum vallate papilla
Taste & smell receptors are both classified as________ because they both respond to chemicals in solution.
chemoreceptors