Special Senses: Eye and Ear Flashcards Preview

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Flashcards in Special Senses: Eye and Ear Deck (86)
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1

accommodation

a process in which the lens flattens to adjust to something seen at a distance, or thickens for close vision

2

aqueous humor

the fluid produced by the capillaries of the ciliary body; nourishes the cornea, gives shape to the anterior eye, and maintains an optimum intraocular pressure

3

cones

sensory receptors which are concentrated in the central area of the retina and are responsible for color vision

4

conjunctiva

a protective, thin mucous membrane lining the eyelids

5

cornea

the portion of the sclera that covers the anterior section of the eye and is transparent

6

extraocular muscle

attach the eyeball to the orbit and, on impulse from the cranial nerves, move the eyes

7

fovea

an area within the macula that contains only cones and provides the sharpest image

8

iris

a smooth muscle that contacts and relaxes to moderate the amount of light that enters the eye; colored part of the eye except in albinism, in which they are reddish-pink

9

lacrimal gland

tear gland, provides a constant source of cleansing and lubrication for the eye

10

lacrimation

the process of producing tears

11

lens

an avascular structure made of protein and covered by an elastic capsule held in place by thin strands of muscle that make up the ciliary body

12

macula lutea

during daylight, the area of the retina on which the light rays focus

13

meibomian gland

sebaceous glands for the eyelashes, secrete oil to lubricate the eyelashes

14

optic disk

the area that allows a natural blind spot in our vision; where the optic nerve leaves the retina to travel to the brain; there are no light receptors there

15

orbit

the protective, bony socket encasing each of our eyes

16

palpebral fissure

the area where the upper and lower eyelids meet

17

pupil

the dark area in the center of the iris where the light continues its progress through to the lens

18

refraction

bending of light rays (happens through the cornea) so that they are projected properly onto receptor cells in the eye

19

retina

the inner layer of the eye which contains the sensory receptors for images carried by the light rays

20

rods

sensory receptors which appear throughout the retina and are responsible for vision in dim light

21

sclera

means hard; the white of the eye; the outermost lateral and posterior portion of the eye

22

uvea

the middle, highly vascular layer of the eye

23

vitreous humor

jellylike substance between the lens and the retina which holds the choroid membrane against the retina to ensure an adequate blood supply

24

auricle

aka pinna; the flesh-covered cartilage of the outer ear where sound waves are initially gathered

25

cerumen

earwax; protects the ear with its antiseptic property and its stickiness, trapping foreign debris and moving it out of the ear

26

cochlea

part of the outer, bony labyrinth which is an organ of hearing

27

crista ampullaris

the semicircular canals detect dynamic equilibrium, or a sense of sudden rotation, through the function of a structure called the ___

28

eustachian tube

aka auditory tube; a mucous membrane-lined connection between the ears and the throat that equalizes pressure within the middle ear

29

external auditory canal

gathered sound is funneled into the ___

30

external auditory meatus

the opening of the outer ear