Question | Answer |
5 special senses | vision,hearing,equilibrum,smell,taste |
5 general senses | preasure,temperature,pain,touch,position |
thin membrane that lines the inner surface of eyelid and covers the white of eye | conjunctiva |
where are tears produced | lacrimal glands |
function of the nasolacrimal duct | drains tears into ducts near the nasal corner of eye |
middle,pigmented tunic of the eyeball | choroid |
which tunic contains the photoreceptors | retina |
refraction | bending of light rays as they pass from one substance to another of diffrent density |
transparent portion of the sclera | cornea |
4 parts of the eye that participate in refraction | cornea,aqueous humor,lens,vitreous body |
aqueous humor | watery fluid that fill most of the eyeball anterior to the lensand helps maintain the slight foward curve of the cornea |
vitreous body | soft jelly like substance that fills entire space posterer to the lens,maintains shape of eyeball and aids in refraction |
2 receptors cell of the eye | rods and cones |
what kind of light rods function in | dim light |
fovea centralis | tiny depressed area near optic nerve,point of sharpest vision |
color blindness results from a lack of what | retinal cones |
what is the rod pigment | rhodopsin |
night blindness results from a deficiency of what vitamin | vit A |
visual impuses travel through the optic nearve to which part of the brain | visual center in the occipital cortex of the brain |
function of the iris | colored or pigmented part of the eye composed of two sets of muscle fibers, governs the size of the central opening |
is iris extrinsic or intrinsic | intrinsic |
name of the extrinsic eye muscle that circles the bottom of the eyeball | inferior oblique |
prebyopia | loss of visual accommodation that occurs w age,leading to farsightedness |
2 sensory nerves that supply the eye | optic nerve,ophthalmic branch of the trigeminal nerve |
optic nerve | carried visual impulses from the retinal rods and cone to the brain |
ophthalmic branch of trigeminal nerve | carried impulses of pain,touch,and temp from the eye and surrounding parts of the brain |
optic disk | blind spot |
nerve that supplies almost all extrinsic eye muscles | oculomotor nerve |
hyperopia | farsightedness,abnormally short eyeball |
astigmatism | caused by irregularity in the curvature of the cornea or the lens |
scientific term for pinkeye | acute conjunctivitis |
what is the opacity of the lens called | cataract |
glaucoma | condition characterized by excess pearsure of the aqueous humor |
visible external portion of the ear | pinna(auricle) |
where is wax pruduced | external auditory canal |
common name for tympanic membrane | eardrum |
2 parts of the ear that the tympanic membrane seperate | external auditoy canal,middle ear cavity |
name for the 3 small bones in the middle ear | ossicles |
which of the occicles come in contact with the tympanic membrane | malleus |
what does the eustachian tube connect | middle ear cavity and throat/pharynx |
what kind of vestibule contain | equilibrium |
coiled division of the inner ear that contains the receptors for hearing | cochlea |
organ for hearing | organ of corti |
what form of equilibrium do maculae function in | stapes |
what are cristae | receptor for dynamic equilibrium |
what kind of movement do semicircular canals detect | body is spinning or moving in diffrent directions |
otitis media | infection and inflamation of inner ear cavity |
common name for otitis externa | swimmers ear |
otosclerosis | a heredity bone disorder that prevents normal vibration of the stapes |
which part of the tounge are sweet taste most acutely experienced | tip of the tounge |
the interpretation of smell is closely related to what other sence | sense of taiste |
proprioceptors | sensory receptor that aids in judging body position and changes in position,located in muscles, joints and tendons |
where are the receptors for pain | free nerve endings |
analgesics | a drug that relieves pain |
endorphins | released naturally from certain regions of the brain and are associated with the control of pain |
sensory adaption | gradual loss of sensation when sensory receptors are exposed to continuous stimulation |
structers that protect the eye | skull bones of the eye orbit,upper and lower eyelids |
rods | dim light |
cones | bright light, sharp image |
3 divisions of the ear | outer,middle,inner |
presbycusis | slowly progressive loss that often accompanies aging |
taiste | tounge |
smell | epithelium of the superior region of the nasal cavity |
strabismus | divation of the eye that resuls from lack of coordination of the eyeball muscles |
cones are located | in the back of the eye |
3 colors absorbed by cones | red,green,blue |
how do we see colors like orange and purple | range of color, each type of cone overlaps |
what happens in the cone of colorblind people | some cones can simply not see color |
2 organs that are the bodys organ detectors | eyes,ears |
3 organs of balance or equilibrium | semicircular canals,utricle,saccule |
enucleation | removal of eyeball |
ophthalmia neonatorum | acute infection of a new born |
trachoma | acute eye infection caused by clamdia |
retinal detachment | retina seperates from underlying layer of th eye |
strabismus | deviation of the eye resulting in lack eye eyeball muscle coordiantion |