Inner Ear

Question 1

Location of Inner Ear

Answer 1

Petrous Part of Temporal Bone

Question 2

What are the components of the Inner Ear?

Answer 2

Bony Labyrinth: Containing Perilymph and Membranous Labyrinth
Membranous Labyrinth: Containing Endolymph and Sensory Organs

Question 3

Bony Labyrinth
Components

Answer 3

Cochlea
Vestibule
Semicircular Canals

Question 4

Bony Labyrinth
Function of the Endolymph

Answer 4

Auditory Fluids involved in Transmission of Sound Vibrations

Question 5

Bony Labyrinth: Cochlea
What is the Cochlea?

Answer 5

Coiled tube making 2.5 turns around Modiolus

Question 6

Bony Labyrinth: Cochlea
What is the Modiolus?

Answer 6

Central Pyramid of bone around which Cochlea Forms

Question 7

Bony Labyrinth: Cochlea
Modiolus Function

Answer 7

Transmits Vessels and Nerves to Cochlea

Question 8

Bony Labyrinth: Cochlea
What is the Bony Spinal Lamina?

Answer 8

Thin Plate of Bone winding spirally around Modiolus

Question 9

Bony Labyrinth: Cochlea
Bony Spinal Lamina divides Bony Cochlea into ____

Answer 9

__3 compartments__

Question 10

Bony Labyrinth: Cochlea
Compartments of the Bony Cochlea?

Answer 10

Scala Vestibuli
Scala Tympani
Scala Media/Cochlea Duct

Question 11

Bony Labyrinth: Vestibule
Contains …

Answer 11

Utricle and Saccule

Question 12

Bony Labyrinth: Vestibule
Utricle is continuous with ____ and Saccule is continuous with ____

Answer 12

__Semicircular Ducts__
__Cochlear Duct__

Question 13

Bony Labyrinth: Semicircular Canals
Number of Semicircular Canals

Answer 13

Anterior Canal
Posterior Canal
Lateral Canal

Question 14

Bony Labyrinth: Semicircular Canals
The Semicircular Canals open into …

Answer 14

the Vestibule

Question 15

Membranous Labyrinth
Components

Answer 15

Cochlear Duct
Saccule
Utricle
Semicircular Ducts

Question 16

Membranous Labyrinth: Cochlear Duct
What is the Cochlear Duct/Scala Media?

Answer 16

Membranous Duct inside Cochlea

Question 17

Membranous Labyrinth: Cochlear Duct
Organ of hearing inside Cochlear Duct?

Answer 17

Spiral Organ of Corti

Question 18

Membranous Labyrinth: Cochlear Duct
Connections of the Scala Vestibuli

Answer 18

1. Oval Window
2. Scala Tympani at Helicotrema (Apex of Cochlea)

Question 19

Membranous Labyrinth: Cochlear Duct
Pathway of Hearing

Answer 19

Perilymph in Scala Vestibuli and Tympani Stimulated by Sound → Causes Movement of Endolymph in Scala Media → Stimulates Organ of Corti → Cochlear Nerve

Question 20

Membranous Labyrinth: Utricle and Saccule
Location

Answer 20

Vestibule

Question 21

Membranous Labyrinth: Utricle and Saccule
What do they contain?

Answer 21

Macula

Question 22

Membranous Labyrinth: Utricle and Saccule
What is the Macula?

Answer 22

Specialised Epithelial Organ which detects Linear Acceleration

Question 23

Membranous Labyrinth: Semicircular Ducts
Location

Answer 23

Inside Semicircular Canals of Bony Labyrinth

Question 24

Membranous Labyrinth: Semicircular Ducts
Dilated at one end to form the …

Answer 24

ampula

Question 25

Membranous Labyrinth: Semicircular Ducts
Contains ____ which detects ____

Answer 25

__crista ampularis__
__rotational acceleration__

Question 26

Blood Supply of Inner Ear

Answer 26

Labyrinthine (Internal Auditory) Artery

Question 27

Which Artery is the Labyrinthine Artery a branch of?

Answer 27

85% Inferior Cerebellar Artery or
15% Basilar Artery

Question 28

What may cause dizziness, vertigo or tinnitus?

Answer 28

Vertebrobasilar Insufficiency/Ischemia