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

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