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Micro - Ear
Terms in this set (63)
What are 3 functions of the ear?
1. Collect auditory stimuli
2. Transduce the mechanical stimuli
3. transmit nerve impulses to CNS
cranial nerve 8
Parts of the external ear
external ear canal/auditory meatus
tympanic membrane (ear drum)
Location of Ceruminous glands
within the skin of the external acoustic canal
Ceruminous glands (type of gland, produce, mixture of what)
cerumen (ear wax)
sebaceous gland secretion, skin cells, and apocrine sweat gland secretion
Tympanic membrane (what does it separate, invnervated by, types of epithelium on inside and outside, high or low vascularity)
external auditory canal from tympanic cavity
CN 5, 9, 10
inside - simple squamous
outside - stratified squamous epithelium
What are components of the middle ear?
auditory ossicle (bones)
auditory (Eustachian) tube
What is the tympanic cavity filled with?
simple squamous to cuboidal lining
What are the three auditory ossicles?
What is the tensor tympani m?
muscle of malleus
What is the stapedius m? Function?
muscle of stapes
protects the ear from loud sounds
What is the function of the ossicles?
connect tympanic membrane to the membrane of the vestibular (oval) window of the inner ear
What is the ventral portion of the middle ear cavity grossly?
What happens to the vibrations of sound on the tympanic membrane?
transmitted through the middle ear to the cochlea (inner ear) by the ossicles
What is the function of the Eustachian (auditory) tube?
communication between middle ear and nasopharynx for air pressure equalization
What would affect this function?
What is the guttural pouch?
large expansion of ventral portion of the auditory (eustachian) tubes in the horse
Two main components of the inner ear
bony labyrinth (houses membranous labyrinth)
bony labyrinth - structures and what it contains
contains urticle and saccule
contains semicircular ducts
all communicate with urticle
contains cochlear duct
axis of spongy bone
central pillar of bone
bony core (cone)
contains spiral ganglion
Membranous labyrinth - structures and what it contains
3 semicircular ducts
generally canals are outer and ducts are inner
What are the 3 spaces the cochlea is subdivided into? Cochlear apparatus
cochlear duct (scala media)
Scala vestibuli contains...
Cochlear duct contains...
endolymph and Organ of Corti (spiral organ)
Scala tympani contains...
Know the location of each in comparison to each other
Which window is the inlet and which is the outlet of the cochlear apparatus?
oval - in
round - out
What is the pathway of sound through the Cochlea?.... if pathway is the right word for it
outer ear --> tympanic membrane --> malleus, incus , stapes --> vestibular (oval) window --> scala vestibuli --> helicotrema --> scala tympani --> deflects cochlear duct and stimulates spiral organ (organ of Corti)
Major components of the Cochlear Duct?
Organ of Corti
Tectorial membrane (fxn)
vibrated by sound wave energy
D on image
Components of the Organ of Corti and their functions
Hair cells - Stereocilia - movement
Phalangeal cells - support
Pillar cells - moved by sound wave energy and displace hair cells against tectorial membrane
Basilar membrane (fxn)
vibrated by sound wave energy
Stria vascularis (fxn)
T/F: hair cell stereocilia contact the tectorial membrane.
true (slide 33)
part of the Organ of Corti/inner ear
What separates the inner hair cells from the outer hair cells, also true for different phalangeal cells?
the inner tunnel that has outer and inner pillar cells around it respectively
The Cochlear duct is within the _____. This is part of the _____ ____.
Does the Cochlear have a nerve associated with it?
Which frequency produces a higher frequency sound - 500Hz or 24000 Hz?
high - 24000 Hz
What is the Vestibular Apparatus composed of?
organs that detect equilibrium and motion
What structures contain neuroepithelial cells that are within these structures?
Function of macula utriculi and macula sacculi
detect position of head and its linear movement
Function of crust ampullaris
sensitive to angular acceleration and deceleration
Semicircular ducts are found within.....
What is the Macula innervated by?
What is displaced by the gravitational movement or linear acceleration of the endolymph in the saccule and utricle?
What happens in this mechanism of otolith function?
their movement is transmitted to the maculae (of utricule and saccule) by the surrounding gelatinous layer that causes bending of the stereo cilia that in on the sensory hair cells within this region (different from hair cells in the organ of Corti)
What happens when these hair cells are moved by the stereocilia on them?
they send an impulse to the brain by the vestibular branch of cranial nerve 8
in order what are the layers of the macula utriculi (starting with otolith)
otolith (in their gel = statoconial membrane)
hair cells and their nerve fibers
sustentacular cells (supporting cells)
All in the inner ear
Semicircular ducts are able to do what?
detect angular acceleration in any direction
What contains the crista ampullaris of each duct?
Again... What does the crista ampullaris do?
detects angular acceleration and deceleration - sensory epithelium with supporting cells and sensory hair cells
Where do these cells project into?
What is the Cupula?
gelatinous mass, contains stereocilia and kinocilia
What does the Cupula do?
moves and bends hair cells
impulse is generated and sent to brain by the vestibular branch of cranial nerve 8
Picture of crust ampullaris and things
What do the saccule and utricle contain?
What are the hair cells and their function from the crista ampullaris?
they register defection of their stereocilia and transmit that signal to vestibular branch of cranial nerve 8
What are the sustentacular cells doing for the crista ampullaris?
support cells for the hair cells
Explain dynamic equilibrium
Displacement of the cupula by the endolymph stimulates the hair cells in the crista ampullaris of the semicircular ducts
movement of it moves in the opposite direction of the head rotation
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