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Chapter 15 Sense 2
Vocab
| Term | Definition |
|---|---|
| accommodation | Normal adjustment of the eye to focus on objects from far to near. |
| anterior chamber | Area behind the corena and in from of the lense and iris. It contains aqueous humor. |
| aqueous humor | Fluid produced by the ciliary body and found in the anterior chamber. |
| biconvex | Consisting of two surfaces that are rounded, elevated, and curved evenly. (Lens of an eye) |
| choroid | Middle, vascular layer of the eye, between the retina and the sclera. |
| ciliary body | Structure surrounding the lens that connects the choroid and iris. |
| cone | Photoreceptor cell in the retina that transforms light energy into a nerve impulse. |
| conjunctiva | Delicate membrane lining the under surface of the eye lids and covering the anterior eyeball. |
| cornea | Fibrous transparent layer of clear tissue that extends over the anterior portion of the eyeball. |
| fovea centralis | Tiny pit or depression in the retina that is the region of clearest vision. |
| fundus of the eye | Posterior, inner part of the eye. |
| iris | Pigmented layers that opens and closes to allow more or less light into the eye. |
| lens | Transparent, biconvex body behind the pupil of the eye. It bends light rays to bring them into focus on the retina. |
| macula | Yellowish region on the retina lateral to and slightly below the optic disc; contains the fovea centralis, which is the area of clearest vision. |
| optic chiasm | Point at which optic nerve fibers cross in the brain. |
| optic disc | Region at the back of the eye where the optic nerve meets the retina. It is the blind spot of the eye because it contains only nerve fibers, no rods or cones, and is thus insensitive to light. |
| optic nerve | Cranial nerve carrying impulses from the retina to the brain. |
| pupil | Central opening of the eye, surrounded by the iris, through which light rays pass. |
| refraction | Bending of light rays by the corena, lens, and fluids of the eye to bring the rays into focus on the retina. Refract means to break |
| retina | Light-sensitive nerve cell layer of the eye containing photoreceptor cells. |
| rod | Photoreceptor cell of the retina essential for vision in dim light and for peripheral vision. |
| sclera | Tough, white outer coat of the eyeball. |
| thalamus | Relay center of the brain. Optic nerve fibers pass through the thalamus on their way to the cerebral cortex. |
| vitreous humor | Soft, jelly-like material behind the lens in the vitreous chamber; helps maintain the shape of the eyeball. |
| auditory canal | Channel that leads from the pinna to the eardrum. |
| auditory meaturs | Auditory canal. |
| auditory nerve fibers | Carry impulses from the inner eat to the brain. |
| auditory tube | Channel between the middle ear and the nasopharynx |
| auricle | Flap of the ear; the protruding part of the external ear. |
| cerumen | Waxy substance secreted by the external ear (earwax). |
| cochlea | Snail shell-shaped, spirally wound tube in the inner ear; contains hearing-sensitive receptor cells. |
| endolymph | Fluid within the labryinth of the inner ear. |
| eustachian tube | Auditory tube. |
| incus | Second ossicle (bone) of the middle ear. |
| labryinth | Maze-like series of canals of the inner ear. Includes cochlea, vestibule and semicircular canals. |
| malleus | First ossicle of the middle ear |
| organ of Corti | Sensitive auditory receptor area found in the cochlea of the inner ear. |
| ossicle | Small bone of the ear; includes the malleus, incus and stapes. |
| oval window | Membrane between the middle ear and the inner ear. |
| perilymph | Fluid contained in the labyrinth of the inner ear. |
| pinna | Auricle; flap of the ear. |
| semicircular canals | Passages in the inner ear associated with maintaining equilibrium. |
| stapes | Third ossicle of the middle ear |
| tympanic membrane | Membrane between the outer and the middle ear (eardrum) |
| vestibule | Central cavity of the labyrinth, connecting the semicircular canals and the cochlea. |
Created by:
brittm1719
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