using your knowledge 24 – Flashcards
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strabismus, a misalignment of the eyeball caused by an imbalance in the extrinsic eye muscles, is also called lazy eye or wandering eye. Identify the extrinsic eye muscle that would cause lateral strabismus of the right eye
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medial rectus
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why do photographers use a red light in the darkroom when developing black and white film?
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the film isn't sensitive to red light only blue light so it wont get developed
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name all the accessory eyeball structures, fluids, and retinal layers that light passes through before it hits the photoreceptors
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cornea, aqueous humor in aqueous cavity, leans, vitreous body in vitreous cavity, axons from ganglionic cells, ganglionic cell layer, bipolar cell layer, photoreceptor
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explain why the retina can detach from the eyeball with just a blow to the back of the head
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retina is only attached to the eyeball by the optic nerve. If this gets detached or even if a tear forms in the retina and fluid can get between the retina and the eyeball, detachment can occur
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explain why a pituitary tumor may affect vision
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optic chasms superior to pituitary gland and a tumor there may press on optic chiasm
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a 10 year old boy has 20/20 distance vision and 20/60 near vision. What refraction abnormality does he have?
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hyperopia
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explain why macular degeneration causes loss of vision in the center of the field of vision and blurriness in the periphery
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central part of the visual field is abnormal due to degeneration of the mucula lutae in glaucoma, peripheral vision field is affected first
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what structure keeps a contact lens on the cornea and prevents it from becoming lodged on the posterior surface of the eyeball
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conjunctival fold
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sound waves enter the external auditory canal cause vibrations in structures and fluids of the ear. Identify in order of the structures and fluids that vibrate in the pathway from the external auditory canal to the spiral organ of corti
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tympanic membrane, malleus, incus, stapes, oval window, perilymph of scala vestibuli and scala tympani, vestibular membrane, endolymph of cochlear duct, basilar membrane, spiral organ of corti
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what do the receptor cells for hearing, static equilibrium, and dynamic equilibrium have in common?
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they all have hair bundles
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would the receptors for equilibrium work in space at zero gravity?
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crista would still be able to detect rotational acceleration and the macula would be able to detect linear acceleration. However, the macula wouldn't be able to detect the position of the head bc that is dependent on the effect of gravity on otolithic membrane
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describe a sense of movements that would stimulate all semicircular duct receptors and if repeated cause vertigo
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rotation along the sagittal, coronal, and transverse
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why do we sniff when we wish to small something better?
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we sniff to force air into the superior portion of the nasal cavity. This is the region of the nasal cavity that contains the olfactory receptors
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when you lick ice cream off an ice cream cone, which papillae are involved in scraping the ice cream off the cone?
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filiform papillae
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licking cold ice cream off an ice cream cone stimulates a variety of sensory receptors associated with the tongue. Name all the sensory receptors involved.
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taste buds, cold, touch, and pressure receptors
