Ent Practical - Ear Anatomy

Question 1

What two structures contain perilymph?

Answer 1

Membranous labyrinth and bony labyrinth

Question 2

What structure contains endolymph

Answer 2

Membranous labyrinth

Question 3

What two structures are contained with the labyrinths?

Answer 3

Semicircular canals and cochlea

Question 4

What two structures make up the vestibular apparatus

Answer 4

Vestibule and semicircular canals

Question 5

Where is the vestibule found

Answer 5

In central portion of bony labyrinth, posterior to the cochlea and anterior to the semicircular canals

Question 6

What is suspended in the perilymph of the vestibule

Answer 6

2 membranous sacs: the saccule and the utricle

Question 7

What is the saccule continuous with

Answer 7

The membranous labyrinth; extends anteriorly as the cochlear duct

Question 8

What is the utricle continuous with

Answer 8

Semicircular ducts that extend posteriorly into semicircular canals

Question 9

What are the maculae

Answer 9

Equilibrium receptor regions of sacs; transmit changes in head position

Question 10

What are the three semicircular canals

Answer 10

Anterior, posterior, and lateral

Question 11

What is contained in each semicircular canal?

Answer 11

Semicircular duct that communicates with utricle anteriorly

Question 12

What is the enlarged swelling at the end of each duct

Answer 12

Ampulla

Question 13

What is the equilibrium receptor region that responds to rotational movements of the head

Answer 13

Crista ampullaris

Question 14

What is the position of the head sensed while head and body remain stable

Answer 14

Static equilibrium

Question 15

What responds to linear acceleration

Answer 15

Macula of utricle and saccule

Question 16

During static equilibrium, what responds to tilting of the head to the side?

Answer 16

Utricle; macula is horizontal

Question 17

During static equilibrium, what responds to vertical movement

Answer 17

Saccule; macula is vertical

Question 18

What is it called when the head and body move or rotate, motion is detected, and aids in balance

Answer 18

Dynamic equilibrium

Question 19

What controls dynamic equilibrium

Answer 19

Semicircular canals

Question 20

What does the cochlea coil around

Answer 20

Bony modiolus

Question 21

What structure is along the modiolus

Answer 21

Osseous spiral lamina

Question 22

What goes through the center of the cochlea and what is it filled with

Answer 22

Cochlear duct filled with endolymph

Question 23

What is the cavity of the cochlea divided into and what is it filled with

Answer 23

Scala; perilymph

Question 24

What is the receptor of sound and what structure on it

Answer 24

The hairs on the organ of corti

Question 25

What supports the organ of corti

Answer 25

Basilar membrane

Question 26

What is above the hair cells

Answer 26

Tectoral membrane

Question 27

What is sound

Answer 27

A series of pressure disturbances of varying frequencies

Question 28

Movement of the stapes transmits vibration to the ______ in the ______

Answer 28

Perilymph; scala vestibuli

Question 29

Vibrations pass through and enter _____ of the _____

Answer 29

Endolymph; cochlear duct

Question 30

What is the normal range of decibels for humans without extreme pain

Answer 30

Up to 120db