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34 terms

Anatomy The Ear

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Internal Ear is involved with?
(labyrinth) In both hearing and equilibrium
The auricle (pinna) is composed of:
Helix (rim)
Lobule (earlobe)
Tympanic membrane (eardrum)
Boundary between external and middle ears
Connective tissue membrane that vibrates in response to sound
Transfers sound energy to the bones of the middle ear
Middle Ear
Epitympanic recess—superior portion of the middle ear
Pharyngotympanic (auditory) tube—connects the middle ear to the nasopharynx
Equalizes pressure in the middle ear cavity with the external air pressure
Ossicles include
Three small bones in tympanic cavity: the malleus, incus, and stapes
The Cochlea
Contains the cochlear duct, which houses the spiral organ of Corti
The Cavity of the Cochlea is divided into 3 chambers:
Scala vestibuli—abuts the oval window, contains perilymph
Scala media (cochlear duct)—contains endolymph
Scala tympani—terminates at the round window; contains perilymph
Sensitivity to Pitch is?
determined by location of hair cells that are stimulated. High pitches toward the outside of cochlea, low pitches at the center
Conduction deafness
results from conditions that interfere with transmission of vibrations to inner ear.
Neuronal deafness
results from the death of hair cells or neuronal elements associated with hearing
Tinnitus
a ringing or roaring in the ears -causes are not well understood, some may
be due to exposure to loud sounds or to fluid
pressure in the cochlea.
Vestibular apparatus consists of the
Equilibrium receptors in the semicircular canals and vestibule
Vestibular receptors
monitor static equilibrium
Semicircular canal receptors monitors
Dynamic Equilibrium
Maculae in the "utricle" respond to?
Respond to horizontal movements and tilting the head side to side
Maculae in the "saccule" respond to?
vertical movements
Bending of hairs in the cristae causes
Depolarizations, and rapid impulses reach the brain at a faster rate
3 parts to the "inner ear"
Semicircular Canal, Vestibule, & Cochlea
The Vestibule cochlea nerve runs through the? and includes the:
Vestibule
Utricles, sacculers andf macule
Otoliths and hair cells
Cochlear nerve goes through the?
Cochlear
Scala = ?
Duct
Bony Laberyinth contains?
Fluid called Perilymph
Dynamic equilibrium is?
Changing, in motion
Static equilibrium?
when your standing in place but you feel like your still moving
Otolithic (Otoliths)
Rocks in your head
Round window (ear)
Lets Vibraions out
Oval Window and Round window are in the?
Vestibule
The Cochlea is a spiral, bony chamber (organ of corti) that contains:
Receptors for hearing & the sensory hair cells and nerve ending of the cochlea nerve.. VII
Balance & Vestibular sense?
Static Balance
External Ear consists of the?
Pinna (Auricle)
External Auditory Meatus
Tympanic Membrane (eardrum)
Middle Ear consists of the?
The Three Ossicles
1) Hammer (Malleus)
2) Anvil (Incus)
3) Stirrup (Stapes)
The Inner Ear consists of the?
Cochlea (snail)
1) Vestibular Duct and membrane
2) Cochlear Duct (scala media), basilar membrane
3) Spiral Organ of Corti
4) Tympanic Duct
Semicircular Canal is dynamic balance and includes the?
Crista Ampullaris, Endlymph, and Hair Cells
Organ of Cori includes 3 ducts and 3 Membranes