Hearing & Equilibrium Flashcards
What is the Anatomy of the Ear?
There is 3 main regions:
External Ear, Middle & Inner ear.
What does the External Ear consist of?
Consist of Auricle, External Auditory canal and Eardrum.
What does the middle ear consist of?
Separated from the External ear by the Eardrum and from the Internal Ear by a thin bony partition that contains 2 small openings, Oval window and Round window.
Middle ear also consist of 3 bones.
What does the Inner ear consist of?
There is 2 main divisions in the inner ear:
Outer bony labyrinth that inclose the inner Membranous Labyrinth.
What is the Eardrum?
The (Tympanic membrane) is a Semitransparent partition between the External auditory canal and middle Ear.
What are the 3 bones of the Middle Ear?
These are the 3 smallest bones in the body.
The Auditory Ossicles which are connected by Synovial joints.
Malleus, incus & Stapes.
What is the Anterior Wall of the Middle ear?
It contains an opening that leads directly not the Auditory Tube called Eustachian tube.
How does Vertigo Develop?
If pressure in the Middle ear is not equalized.
In the inner ear there is a series of cavities in petrous portion of temporal bone, What are the 3 areas?
Semicircular Canals, Vestibule & the Cochlea.
What are the Nature of Sound waves?
Sound-waves are alternating high and low pressure regions Travelling in the same direction through a medium.
What is the Pitch of a Sound-wave?
This is the Frequency of a sound vibration.
What is the Pitch of a Sound-wave?
This is the Frequency of a sound vibration.
Sounds heard most acutely by the human ear are those form sources that vibrate at frequencies between 500-5000 hertz.
What is the Pitch of a Sound-wave?
This is the Frequency of a sound vibration.
Sounds heard most acutely by the human ear are those form sources that vibrate at frequencies between 500-5000 hertz.
What is the Auditory Pathway?
Bending of the Hairs in the inner Ear generates nn impulses in the sensory neurons that innervate the hair cells.
Nn impulses pass along the Axons of these neurons, which form from the Cochlear branch of the Vestibular Nn.
These Axons synapse with neurons in the cochlear Nuclei no the same side.
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