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Senses Chpt 10

Senses Chptr 10

Mechanoreceptors Touch & pressure are from free nerve endings deform or displace tissues
Meissner's Corpuscles Light touch pressure sensor
Pacini Corpuscles Heavy touch pressure sensor
Proprioception Sense of position or orientation of the body, Rate of movement one body part to another
Thermorceptors Located immediately under the skin, most on the lips, least on the broad surfaces body trunk
More cold or hot receptors 10x more cold receptors than hot
location of most thermoreceptors on the lips
Nociceptors Pain free nerve endings stimulated by tissue damage, skin & tissues of the internal organs, they don't adapt & will continue to make you feel pain even when stimulus stops
Gustatory Sense of taste a chemoreceptor, Thalmus controlled to parietal lobe
parts of Gustatory (taste) Taste Buds, Papillae, taste pore, taste hairs (microvilli)
2 types of Gustatory nerves facial nerve and glossapharyngeal nerve
Name general senses Touch, Pressure, Temperature, Pain, Proprioception (position/orientation)
Chemoreceptor Chemical (chemical changes in taste & smell)
Mechanoreceptors pressure (bending/deforming cell/tissue) in joints, hearing, equilibrium)
nociceptors pain receptor (tissue damage)
thermoreptors temperature (heat & cold)
Photoreceptors light energy (vision)
receptor detector (chain/steps) Stimulus-receptor dectection-CNS to interpret
Odors pleasant/unpleasant, unnoticed after a time, can result in nausea
cold adaptation cold/hot abruptly then the receptors adapt (ex cold water in pool)
Headache referred surfaces of the head, or menignes & blood vessels, sinuses, eyes
Bitter Taste highest degree of sensitivity, reject it, poisons and toxins
Blinking eye blinks 6-30 times/min, stimulates lacrimal glands to secrete tears to lubricate across the eye
Corneal transplant readily accessible, easy to remove, avascular (no bleeding)less rejection, long term success (one of the 1st organs xplant)
Pupils Dialate during problem solving, or if subj is appealing, reflexes reflecting interest or emotional state, Restrict if boring repulsive
Detaached Retina sensory portion breaks away, Trauma or eye disorder, resulting in distored vision eventual blindness, reattach via laser Sx
Color Blindness absence or def in cones, common red/green, inherited > males
Ruptured Eardrum perforated by shock waves from explosion, scuba, trauma, acute middle ear infections, acute pain, noise, hearing impairment
Motion Sickness nausea/vomiting, resulting repetitive/ excessive stimulation of equilibrium receptors some are more suseptible than others
name 4 different taste receptors and where they are located on the tongue Salty (tip of tongue) Sweet (just behind tip of tongue), Sour (sides of middle of tongue) Bitter (back of tongue left to right)
Bony Socket (bony orbit)does what for the eye? Protects it
Accessory Structures do what for the eye? protect and move the eyes
Eye brow function keeps perspiration out of the eye, it can cause irritation
Eyelids function open and close the eye, keep foreign objects out
Conjuctiva keeps the eye from drying out, thin mucous membrane that lines the eyelid,covers most of the eye except the cornea
Muscles associated with the eyelid Orbicularis Oculi, (closes the eye) & Lavator Palpebrae Superioris (opens the eye)
Eyelash function helps trap foreign particicles
Sebaceous glands associated with eyelashes) secrete oily fluid that lubricates the region (inflamation is a stye)
Lacrimal Gland does what produces tears
Sclera is what whites of the eyes (= 5/6 of the eye)
Cornea "window of the eye" transparent layer outside of the eye
Choroid vascular brown pigmented layer posterior of eye
Iris colored part of the eye
pupil doughnut shaped diapharagm (lets in/out light) dialates and constricts
Retina "visual part of the eye" innermost layer of the eye, posterior, contains rods & cones
Optic Nerve Visual impulses to the brain
Rods low light vision (night vision)
Cones color vision
Type of sight chart most used Snellen
Color Chart Ishihara
OD Right Eye
OS Left Eye
OU both eyes
Aqueous Humor liquid maintains shape of eye & provides nutrients (front of eye shape, eye pressure)
Vitreous Humor presses retina to the wall of the eye, supports internal shape, provides nutrients (eyeball shape)
Refraction the bending of light rays
accomodation adjustment to the vision of the eye
Auditory sense of hearing
AD Right Ear
AS Left Ear
AU both ears
External ear also known as Auricle or Pinna
Fleshy part of ear Auricle or Pinna
Otitus Externa Swimmer's Ear
Tinitus ringing of the ears
Otinius Media middle ear infection
Tympanic Membrane think membrane middle ear, vibrates with stimulus
3 bones inside ear Malleus, Staples, Incus
Eustachian Tube aka Auditory tube; connects ears to throat
Bony Labryrinth - itis infection of the inner ear
Cochlea snail like coil inner ear (bony labyrinth) functions in hearing
cerumen ear wax
Meniere's disease lifelong chronic inner ear disease, recurring attachks, dizziness, loss, tinnitis
Tinnitus ringing or buzzing in the ears
Vertigo Feeling of dizziness, loss of balance, room spinning
Blepharitis inflation of the edges of the eyelid
Glaucoma increased pressure in the eye, if untreated blindness
Macular Degeneration breakdown of cells in macula lutea, central vision (older people)
Nyctalopia night blindness
Otosclerosis formation of bony tissue around oval window immobilizing stapes (ear) results in deafness
Presbycusis impairment of hearing from aging
Presbyopia impairment of vision from againg
Sensorineural deafness noise related ear damage to the cochlea (pathway to cortex cerebelum)
Tympanitis inflammation of the tympanic membrane
Quiz: The _______ is the white portoion of the eye SCLERA (watch the spelling)
Quiz: The _______ is the colored part of the eye. IRIS
Quiz: Medical term for middle ear infection Otitinus Media
Quiz: Medical term for ear wax Cerumen
Quiz: This gland produces tears Lacrimal
Quiz: Medical term for Swimmer's Ear Otitus Externa
Quiz: The external is called the Auricle or Pinna
Quiz: Stimulated by heavy pressure Pacini's corpuscle
Quiz: The sense of sight can be classified as: Photoreceptor
Quiz: OD Right Eye
Quiz: How many feet should a patient stand away from the snellen chart when testing for visual acuity? 20 feet
Quiz: The sense of smell can be classified as chemoreceptiors
Quiz: Important in sensing light discrimination touch stimuli Meissner corpuscle
Quiz: Receptors for color vision cones
Quiz: Fluid that helps maintain shape of anterior part of th eeye Aqueous humor
Quiz: Olefactory means smell
Quiz: Medication used to treat conjunctivitis Eyrthromycin
Quiz: Regulates amount of light that enters the eye Pupil
Quiz: Which of the following taste buds are located in the back of the tongue? Bitter
Quiz: Connects the middle ear to the throat Eustachian tube
Quiz: The cochlea is located in the Inner Ear
Quiz: Transmits sound to the cochlea Ossicles
Quiz: Location of the ossicles Middle ear
Quiz: Disease of the eye characterized by increased intraocular pressue, which can lead to blindness Glaucoma
Quiz: The eardrum is also called the Tympanic Membrane
Quiz: The sense of balance occurs in the Semicircular canals & the vestibule
Quiz:Ringing in the ears is called Tinnitus
Quiz: Medication used for dizziness Meclizine
Bonus Quiz Question: name the 3 occicles Malleus, Incus, Stapes
Created by: dwall2674