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Special Senses

Anatomy Senses

Aqueous Humor the watery fluid between the cornea and the crystalline lens. It maintains the pressure needed to inflate the eye and provides nutrition for the central cornea and lens as they do not have their own blood supply.
Cataract a medical condition in which the lens of the eye becomes progressively opaque, resulting in blurred vision.
Accomodation he process by which the vertebrate eye changes optical power to maintain a clear image or focus on an object as its distance varies
Optic Nerve each of the second pair of cranial nerves, transmitting impulses to the brain from the retina at the back of the eye.
Suspensory Ligament a ligament or fibrous membrane suspending an organ or part; especially : a ringlike fibrous membrane connecting the ciliary body and the lens of the eye and holding the lens in place
Ciliary Body the part of the eye that connects the iris to the choroid.
Glocoma a condition of increased pressure within the eyeball, causing gradual loss of sight.
Viterous Humor the transparent jellylike tissue filling the eyeball behind the lens.
Refraction the bending of light that takes place within the human eye
Cornea the transparent layer forming the front of the eye.
Canal of Schlemm a circular channel in the eye that collects aqueous humor from the anterior chamber and delivers it into the bloodstream via the anterior ciliary veins.
Hyperopia farsightedness.
Myopia nearsightedness.
Night Blindness less technical term for nyctalopia.
Astigmatism a defect in the eye or in a lens caused by a deviation from spherical curvature, which results in distorted images, as light rays are prevented from meeting at a common focus.
Emmetropia a state in which the eye is relaxed and focused on an object more than 6 meters or 20 feet away. The light rays coming from that object are essentially parallel, and the rays are focused on the retina without effort.
Iris a flat, colored, ring-shaped membrane behind the cornea of the eye, with an adjustable circular opening (pupil) in the center.
Convergence the simultaneous inward movement of both eyes toward each other, usually in an effort to maintain single binocular vision when viewing an object.
Fovea Centralis a small depression in the retina of the eye where visual acuity is highest. The center of the field of vision is focused in this region, where retinal cones are particularly concentrated.
Retina a layer at the back of the eyeball containing cells that are sensitive to light and that trigger nerve impulses that pass via the optic nerve to the brain, where a visual image is formed.
Sclera the white outer layer of the eyeball. At the front of the eye it is continuous with the cornea.
Choroid Coat the pigmented vascular layer of the eyeball between the retina and the sclera.
Anvil small bone is one of three ossicles
Hammer connects with the incus and is attached to the inner surface of the eardrum
Semicircular Canals part of the inner ear. lined with cilia and filled with a liquid substance, known as endolymph. Every time the head moves, the endolymph moves the cilia. This works as a type of motion sensor, as the movements of the cilia are communicated to the brain.
Auditory Tube a tube that links the nasopharynx to the middle ear. It is a part of the middle ear.
Oval Window a small natural hole or opening, especially in a bone.
Cochlea the spiral cavity of the inner ear containing the organ of Corti, which produces nerve impulses in response to sound vibrations.
Perilymph the fluid between the membranous labyrinth of the ear and the bone that encloses it.
Stirrup a tiny, U-shaped bone that passes vibrations from the stirrup to the cochlea.
Pinna the external part of the ear in humans and other mammals; the auricle
Endolymph the fluid in the membranous labyrinth of the ear.
Typanic Membrane a membrane forming part of the organ of hearing, which vibrates in response to sound waves. In humans and other higher vertebrates it forms the eardrum, between the outer and middle ear.
External Auditory Canal is a tube running from the outer ear to the middle ear.
Round Window a small natural hole or opening, especially in a bone. The mammalian middle ear is linked by the fenestra ovalis to the vestibule of the inner ear, and by the fenestra rotunda to the cochlea.
Vestibule an oval cavity in the middle of the bony labyrinth.
Created by: jae.moore124



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