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External anatomy of the ear PowerPoint Presentation

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Description : Check out this medical presentation on Ear, Nose, and Throat Facts, which is titled "External anatomy of the ear", to get an overview of the anatomy of the external ear, middle ear and internal ear.

Tags : Ear, Nose, Throat Facts, External anatomy, ear, middle ear, internal ear

Published on : Jul 10, 2021 | Views : 2360 | Downloads : 0

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Slide 1-

External anatomy of the ear Pinna Helix Antihelix Tragus Antitragus Triangular Fossa Concha Lobule
Slide 2-

Three Parts of the Ear
Slide 3-

Overview of the anatomy of the external ear, middle ear and internal ear
Slide 4-

Gross Anatomy of the Middle Ear
Slide 5-

Gross Anatomy of the Inner Ear
Slide 6-

Anatomy of the Cochlea
Slide 7-

Sectional View of the Cochlear as it will appear on a microscope slide
Slide 8-

Internal Anatomy of the Cochlea with details of the Bony Labyrinth
Slide 9-

Internal Anatomy of the Bony Labyrinth with details of the Organ of Corti
Slide 10-

Events involved in the creation of an Auditory action impulse Pinna directs sound waves into the external auditory meatus. Sound waves cause the tympanic membrane to vibrate. a. Slowly for low- frequency sounds b. Rapidly for high- frequency sounds c. Distance the membrane travels during these vibrations relates to loudness or decibels.
Slide 11-

Events involved in the creation of an Auditory action impulse Vibrations are communicated from the tympanic membrane to the auditory ossicles. Malleus Incus Stapes Stapes vibrates back and forth in the oval window, thus vibrating the oval window membrane. Vibration of oval window membrane causes fluid pressure waves in the perilymph of the scala vestibuli.
Slide 12-

Events involved in the creation of an Auditory action impulse Perilymph pressure waves are transmitted to the scala tympani and eventually to the round window causing the secondary tympanic membrane to bulge outward. Vibrations of the vestibular membrane cause vibrations of the endolymph within the cochlear duct. Endolymph pressure waves cause the basilar membrane to vibrate.
Slide 13-

Events involved in the creation of an Auditory action impulse 8a. Vibrations of the basilar membrane cause the the hair cells of the Organ of Corti to vibrate. 8b. Hair cells vibrate upward, bending the stereocilia against the tectorial membrane. 8c. Bending the stereocilia produces a receptor potential that ultimately leads to a action potential on Cochlear nerve.
Slide 14-

Auditory Pathway First-order neurons in the Cochlear branch of the Vestibulocochlear nerve Cochlear nuclei in the medulla Superior Olivary nuclei in the medulla Inferior colliculus Medial geniculate nuclei of the thalamus Primary auditory area of the superior temporal gyrus