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Flashcards in Ears: Deck (17):
1

Ear:

sensory organ for hearing & equalibrium(balance)

divided into 3 regions

2

the 3 regions of the ear:

external ear

middle (tympanic cavity)

inner ear

3

External Ear:

includes the AURICLE(PINNA), Accoustic meatus

the eardrum/tympanic membrane is at the end f the external acoustic meatus

4

Where does the external acoustic meatus travel to?

through the TEMPORAL Bone, connecting the auricle to the tympanic membrane

5

Tympanic Membrane:

thin, translucent membrane of CT

forms a segment b/w the external & middle ear

soundwaves through the external acoustic meatus, cause the tympanic membrane to vibrate

transfers soundwaves to the bony ossicles in the middle ear

6

Inner Ear/ Labyrinth

2 compartments

bony labyrinth & membranonous labyrith

contains: vestibule, semicircular canals, cochlea

7

Bony Labyrith:

a maze of bony passages, course through the temporal bone


contains fluid- Perilymph

8

Membranous Labyrith:

network of membranoous capsules w/in the bony labrith

contains fluid- Endolymph

9

Fluids in the inner ear function:

provide a medium for conducting sound waves

detect changes in body position

balance movement

10

Middle Ear/ Tympanic cavity:

Air-filled chamber lined w/ muccus mebrane & 3 auditory ossicles

11

The 3 auditory ossicles of the middle ear:

Malleus- attached to the tympanic membrane

Incus

Stapes: attached to oval window

12

Auditory Ossicles function:

Attach/connect the tympanic membrane & inner ear wall


Transmit/ amplify soundwaves across the tympanic cavity to the oval window

13

Pharyngototympanic/ auditry tube:

along the anteior wall of the tympanic cavity

the direct link b/w the middle ear & nasaopharynx (region of throat)

14

Vestible:

central area of the inner ear

divided into 2 regions: utricle & saccule

contains sensory receptors called MACULAE, detect changes in linear movements, gravitational forces

static equalibrium

15

Semicirular Canals:

3 semicircular tubes connected to the posterior wall of the vestibule


anterior, posterior, lateral semicircular canals


at 1 end of each canal is a region called an AMPULLA

16

Ampulla:

inside each Ampulla, a region called the CRISTA-AMPULLARIS


contains sensory receptors that detect changes in angular acceleration/ deceleration

dynamic equalibrium

17

Cochlea:

snail-shaped structure

coils around the central axis of bone

on anterior wall of the vestible

sensory receptors for hearing

spinal organ/ ortgan of corti

sound cause the fluid to move