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Special Senses Ch 15

Olfaction, taste, visual system, hearing and balance - Seeley Ch 15

Why is the olfactory epithelium unique? Neurons are replaced as they wear down.
The only major sense that does not go through thalamus Olfactory Cortex
List the four types of papillae Vallate, fungiform, foliate, and filiform
supporting cells surrounding taste (gustatory) cells that are replaced every 10 days taste bud
List three factors that modify taste Texture, temperature and olfaction
space between eyelids Palpebral fissure
lateral and medial, eyelids meet Canthi
produces tears to moisten, lubricate, wash. Tears pass through ducts and then over eye Lacrimal gland
collect excess tears through openings called puncta Lacrimal canaliculi
white outer layer of eye that maintains shape, protects internal structures, provides muscle attachment point, continuous with cornea Sclera
Layer of stratified squamous epithelium on the outer surface of the eye. Cornea
colored part of the eye, controls light entering the pupil Iris
produces aqueous humor that fills anterior chamber Ciliary body
Parasympathetic muscle that reduces the amount of light entering the eye Sphincter pupillae
Sympathetic muscle that increase the amount of light entering the eye Dilator pupillae
Pigment of this layer and choroid help to separate sensory cells and reduce light scattering. Pigmented Retina
inner layer of rod and cone cells sensitive to light Sensory Retina
area of greatest visual acuity in retina; photoreceptor cells tightly packed Fovea
Small yellow spot on retina macula lutea
Blind spot where blood vessels enter the eye Optic disc
abnormal increase in intraocular pressure Glaucoma
Posterior compartment: posterior to lens. Filled with jelly-like _________________. vitreous humor
Aqueous humore is roduced by ____________ and returned to venous circulation through the _____________. ciliary process and canal of Schlemm
The lens is held by _____________ attached to ciliary muscles. suspensory ligaments
The lens changes shape as ___________ contract and relax. ciliary muscles
portion of electromagnetic spectrum detected by human eye visible light
bending of light refraction
light striking a convex surface Convergence
point where light rays converge and cross Focal point
causing light to converge Focusing
Normal resting condition of lens. Ciliary muscle is relaxed. Lens is flat. Emmetropia
Point at which lens does not have to thicken to focus. 20 feet or more from eye. Far point of vision
As objects move close to the eye, eyes are rotated medially. Convergence
List the three layers of the sensory retina Photoreceptor, bipolar, and ganglionic
Produces black and white vision Rods
Name the two components of rhodopsin Opsin and Retinal
Responsible for color vision and visual acuity. Cones
Visual pigment is ___________, there are three types that respond to blue, red and green light iodopsin
elastic cartilage covered with skin of the external ear Auricle or Pinna
The external ear canal is also called the _____________. External auditory meatus
Thin membrane of two layers of epithelium with connective tissue between. Sound waves cause it to vibrate. Border between external and middle ear. Tympanic membrane
Ear Wax Cerumen
that opens into pharynx, equalizes pressure in middle ear Auditory or eustachian tube
Ossicles that transmit vibrations from eardrum to oval window Malleus, incus, and stapes
connection between middle and inner ear Oval Window
Foot of the stapes rests on the oval window and is held in place by the ______________. annular ligament
Fluid in the membranous labyrinth Endolymph
Fluid in the space between membranous labyrinth and periosteum of bony labyrinth Perilymph
Scala vestibuli extends from the oval window to the _____________ at the cochlear apex helicotrema
Wall of scala vestibuli is the _____________. vestibular membrane
Wall of scala tympani is the _______________. basilar membrane
space between vestibular and basilar membranes, filled with endolymph Cochlear duct
Near oval window basilar membrane responds to ________-frequency vibrations, Near helicotrema responds to ________-frequency vibrations High, low
Their flux causes transduction of sound stereocilia
sensory cells with hair-like projections at the apical ends Hair Cells
Vibrations of the __________ in the scala vestibuli and of the endolymph in the _________________ are transferred to the perilymph of the scala ___________. perilymph, cochlear duct, tympani
A reflex that protects hearing by contracting muscles during loud noises, controlled by cranial nerves V and VII. Attenuation reflex
Evaluates position of head relative to gravity Static Labyrinth (Vestibule)
Evaluates rate of movement of the head in three dimensional space Kinetic labyrinth: semicircular canals
Name the three semicircular canals filled with endolymph transverse plane, coronal plane, sagittal plane
The ________ is suspended over crista hair cells. Acts as a float displaced by fluid movements within semicircular canals. Cupula
Created by: 599966851