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
Three small bones in tympanic cavity: the malleus, incus, and stapes
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
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.
Vestibular apparatus consists of the
Equilibrium receptors in the semicircular canals and vestibule
monitor static equilibrium
Semicircular canal receptors monitors
Maculae in the "utricle" respond to?
Respond to horizontal movements and tilting the head side to side
Maculae in the "saccule" respond to?
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?
Scala = ?
Bony Laberyinth contains?
Fluid called Perilymph
Dynamic equilibrium is?
Changing, in motion
when your standing in place but you feel like your still moving
Rocks in your head
Round window (ear)
Lets Vibraions out
Oval Window and Round window are in the?
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?
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?