Ears:

Question 1

Ear:

Answer 1

sensory organ for hearing & equalibrium(balance)

divided into 3 regions

Question 2

the 3 regions of the ear:

Answer 2

external ear

middle (tympanic cavity)

inner ear

Question 3

External Ear:

Answer 3

includes the AURICLE(PINNA), Accoustic meatus

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

Question 4

Where does the external acoustic meatus travel to?

Answer 4

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

Question 5

Tympanic Membrane:

Answer 5

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

Question 6

Inner Ear/ Labyrinth

Answer 6

2 compartments

bony labyrinth & membranonous labyrith

contains: vestibule, semicircular canals, cochlea

Question 7

Bony Labyrith:

Answer 7

a maze of bony passages, course through the temporal bone

contains fluid- Perilymph

Question 8

Membranous Labyrith:

Answer 8

network of membranoous capsules w/in the bony labrith

contains fluid- Endolymph

Question 9

Fluids in the inner ear function:

Answer 9

provide a medium for conducting sound waves

detect changes in body position

balance movement

Question 10

Middle Ear/ Tympanic cavity:

Answer 10

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

Question 11

The 3 auditory ossicles of the middle ear:

Answer 11

Malleus- attached to the tympanic membrane

Incus

Stapes: attached to oval window

Question 12

Auditory Ossicles function:

Answer 12

Attach/connect the tympanic membrane & inner ear wall

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

Question 13

Pharyngototympanic/ auditry tube:

Answer 13

along the anteior wall of the tympanic cavity

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

Question 14

Vestible:

Answer 14

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

Question 15

Semicirular Canals:

Answer 15

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

Question 16

Ampulla:

Answer 16

inside each Ampulla, a region called the CRISTA-AMPULLARIS

contains sensory receptors that detect changes in angular acceleration/ deceleration

dynamic equalibrium

Question 17

Cochlea:

Answer 17

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