Ch 18 Flashcards
Modified sweat glands of the eye between the eyelashes
Ciliary glands
This covers the inner surface of the eyelids and anterior surface of the eye
Conjunctiva
This is a membrane that produces mucous to lubricate the eye
Conjunctiva
The fibrous tunis consists of (2)
Sclera
Cornea
This part of the eye is a transparent window for light entry
Cornea
This part of the eye shapes, protects, and anchors the eye muscles
Sclera
The vascular tunic consists of (3)
Choroid
Ciliary body
Iris
Part of the eye that adjusts the amount of light entering the eye
Iris
Part of the eye that secretes aqueous humor, holds lens in place, and can change the thickness of the lens
Ciliary
Sympathetic stimulation causes radial muscles to contract and the pupil
Dilates
Parasympathetic stimulation causes circular muscles to contract, and the pupil
Constricts
Part of the eye that provides nutrients and absorbs light that prevents reflection and scattering
Choroid
Part of the eye that produces pressure inside the eye for support, supplies nutrients and oxygen, and carries wastes away from the cornea, lens, and retina
Vitreous humor
Part of the eye that supports lens, holds retina in place, and creates intraocular pressure
Vitreous humor
The two layers of the retina are
Pigmented
Neural
Retinal layer that contains photoreceptors for visual perception
Neural
Retinal layer that absorbs light and stores vitamin A
Pigmented
Part of the retina that provides acute color vision in bright light
Fovea centralis
Part of retina that contains no receptors (blind spot)
Optic disc
Part of retina that provides night, dim light, and peripheral vision
Rods
Part of retina that contains widely spaced cones
Macula lutea
The visual pigment made from protein
Opsin
The visual pigment made from vitamin A
Retinal
Part of th eye that bends light to focus precise images on the retina through accommodation
Lens
Nearsightedness is called ___ and the eyeball is too ___ causing distant objects to be focued in front of the ______ causing blurring
Myopia
Long
Retina
Farsightedness is called ___ and the eyeball is too ___ causing nearby objects to be focused behind the ___ causing blurring
Hyperopia
Short
Retina
Irregular curvature in parts of the cornea or lens causes
Astigmatism
Clouding of the lens is called
Cataract
Increased intraocular pressure compressing retina, optic nerve, and blood vessels is called
Glaucoma
Glands that produce wax in the ear
Ceruminous
The covering of the opening of the auditory canal is
Tympanic membrane
This ear tube allows for equalizing pressure
Auditory tube
The eardrum sends vibration to this ear bone
Malleus
The inner ear is also called the ___ which includes the ___ organs for hearing and ___
Bony labyrinth
Sense
Balance
Contained in the organ of corti are ___, which are hair cells, and a gel-like tectorial membrane bends the ___ cells, and the cochlear nerve attached to ___ cells transmits nerve impulses to the ___ on the temporal lobe
Receptors
Hair
Hair
Auditory cortex
The spiral organ of the corti interprets frequencies of vibrations from the cochlea as differences in ___
pitch
The organs of equilibrium have receptor cells with two structures
Vestibules
Semicircular canals
This reports the position of the head
Maculae
In the maculae, hair cells are embedded in the ___ membrane, and otoliths float in a gel around ___ cells, and movements cause otoliths to bend the ___ cells
Otolithic
Hair
Hair
This responds to rotational movements of the head
Semicircular canals
Receptors in the semicircular canals are
Christa ampularis
Olfactory receptors are in the roof of the
Nasal cavity
Interpretation of smells is made in the
Cortex
Taste buds are located on the (3)
Tongue
Soft palate
Cheeks
These cells are the taste receptors
Papillae
The four types of taste sensation receptors are
Sweet
Sour
Bitter
Salty
