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
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
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
results from conditions that interfere with transmission of vibrations to inner ear.
results from the death of hair cells or neuronal elements associated with hearing
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.
Maculae in the "utricle" respond to?
Respond to horizontal movements and tilting the head side to side
Bending of hairs in the cristae causes
Depolarizations, and rapid impulses reach the brain at a faster rate
The Vestibule cochlea nerve runs through the? and includes the:
Utricles, sacculers andf macule
Otoliths and hair cells
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
Middle Ear consists of the?
The Three Ossicles
1) Hammer (Malleus)
2) Anvil (Incus)
3) Stirrup (Stapes)
The Inner Ear consists of the?
1) Vestibular Duct and membrane
2) Cochlear Duct (scala media), basilar membrane
3) Spiral Organ of Corti
4) Tympanic Duct