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Special Senses

Eyes and Ears

QuestionAnswer
Structures of the Inner Ear (3) Vestibule, Cochlea, Semicircular Canals
The Vestibular Apparatus is composed of what two Inner Ear structures? Vestibule and Semicircular Canals
Structures of the External Ear (5) Auricle, Helix, Lobule, External Acoustic Meatus, Tympanic Membrane
Structures of the Middle Ear (7) Malleus, Incus, Stapes, Oval Window, Round Window, Pharyngotympanic Tube, Epitympanic Recess
What are the two muscles located in the Middle Ear? Tensor tympani: stabilizes the eardrum via the malleus Stapedius: stabilizes the stapes
What does the Oval Window do? Leads to the inner ear; holds the stapes
What is the importance of the Pharyngotympanic tube? Leads to the nasal cavity; is normally closed but opens in order to equilibrate external air pressure with pressure inside the ears
Three chambers of the Cochlea Scala Vestibuli, Scala Tympani, Cochlear Duct
What structures make up the Bony Labyrinth? Vestibule, Cochlea, Semicircular Canals
What type of fluid is the Bony Labyrinth filled with? Perilymph: similar to CSF
What type of fluid is the Cochlear Duct filled with? Endolymph: similar to ICF
What is the helicotrema? a region located at the cochlear apex that connects the perilymph containing scala vestibuli and the scala tympani
What is the sensory organ that is located in the cochlea? Spiral Organ of Corti: located in the cochlear duct
Properties of Conduction Deafness Mechanical Problem: problem with the tympanic membrane or ossicles (impacted earwax) Otitis Media: fluid accumulation in middle ear, excessive growth of scar tissue Otosclerosis: overgrowth of tissue fuses stapes to oval window, immobilization of stape
Properties of Sensorineural Deafness damage to hair cells or nerve elements. May be from loud noises, degneration of cochlear nerve, can be treated with cochlear implants
What is Presbycusis A sensorineural deafness that results with the loss of high frequencies of noise due to the effects of aging
Properties of Meniere's Syndrome swelling of the membranous labyrinth that affects all three parts of the inner ear. Caused by excessive endolymph: leads to vertigo, nausea, balance issues
Properties of Tennitus Ringing or clicking sound in the ears in the absence of auditory stimuli; one of the first symptoms of cochlear nerve degeneration
What part of the ear has to do with balance and equilibrium? The vestibular Apparatus (vestibule and semicircular canals)
Created by: kjohnson316