External and Middle Ear

Question 1

Function of the Ear

Answer 1

Hearing
Balance

Question 2

Divisions of the Ear

Answer 2

External Ear
Middle Ear
Internal Ear

Question 3

All the parts of the ear lie within the …

Answer 3

temporal bone of the skull

Question 4

External Ear
Function

Answer 4

Collect and Conduct Sound towards the Middle Ear

Question 5

External Ear
Parts

Answer 5

Auricle
External Auditory Canal
Tympanic Membrane

Question 6

External Ear: Auricle
Parts of the Auricle

Answer 6

Helix
Anti-Helix
Scaphoid Fossa
Concha
Tragus
Lobule

Question 7

External Ear: Auricle
What is the Helix?

Answer 7

Curved Rim of Auricle

Question 8

External Ear: Auricle
Anterior Part of the Helix is called the …

Answer 8

Crus of the Helix

Question 9

External Ear: Auricle
What is the Anti-Helix?

Answer 9

Curved Rim anterior to Helix

Question 10

External Ear: Auricle
Anteriorly, the Anti-Helix divides into …

Answer 10

2 Crura

Question 11

External Ear: Auricle
Scaphoid Fossa location

Answer 11

Between Helix and Anti-Helix

Question 12

External Ear: Auricle
Concha location

Answer 12

Anteroinferior to Antihelix

Question 13

External Ear: Auricle
What is the Tragus?

Answer 13

Curved Flap projecting Posteriorly

Question 14

External Ear: Auricle
Lobule location

Answer 14

Lowest Part of Auricle

Question 15

External Ear: Auricle
Lobule formation

Answer 15

Soft Tissue without Cartilaginous Skeleton

Question 16

External Ear: External Auditory Canal
Extent

Answer 16

From External Acoustic Meatus to Tympanic Membrane

Question 17

External Ear: External Auditory Canal
Shape

Answer 17

S-Shaped

Question 18

External Ear: External Auditory Canal
Parts

Answer 18

Outer Cartilaginous Part (1/3rd)
Inner Boney Part (2/3rd)

Question 19

External Ear: External Auditory Canal
Length

Answer 19

24mm

Question 20

External Ear: Tympanic Membrane
What is the Tympanic Membrane

Answer 20

Oval Disc on the Medial End of the External Auditory Canal

Question 21

External Ear: Tympanic Membrane
It forms the Greater Part of the …

Answer 21

Lateral Wall of the Tympanic Cavity

Question 22

Middle Ear
What is the Middle Ear?

Answer 22

Air-Filled, Mucous Membrane-Linked Space

Question 23

Middle Ear
Limited by …

Answer 23

Laterally: Tympanic Membrane
Medially: Internal Ear

Question 24

Middle Ear
Function

Answer 24

Transmit Vibrations of Tympanic Membrane to Internal Ear

Question 25

**Middle Ear** Communications

Answer 25

Mastoid Area posteriorly Nasopharynx via Eustachian Tube anteriorly

Question 26

**Middle Ear** Walls

Answer 26

**Anterior**: Eustachian Tube **Posterior**: Mastoid Antrum **Superior**: Tegmen Tympani **Inferior**: Fundus Tympani **Medial**: Medial Wall **Lateral**: Tympanic Membrane

Question 27

**Middle Ear** Anterior/Carotid Wall features

Answer 27

Attachment of Tensor Tympani Muscle Opening of Eustachian Tube Related to Internal Carotid Artery

Question 28

**Middle Ear** Posterior/Mastoid Wall features

Answer 28

Aditus to Mastoid Antrum Pyramid gives origin to Stapedius Muscle

Question 29

**Middle Ear** Roof/Tegmental Wall features

Answer 29

Thin Layer of Bone (Tegmen Tympani) separating Middle Ear from Middle Cranial Fossa

Question 30

**Middle Ear** Floor/Jugular Wall features

Answer 30

Separates Middle Ear from Internal Jugular Vein Contains Tympanic Branch of Glossopharyngeal Nerve

Question 31

**Middle Ear** Medial/Labyrinthine Wall features

Answer 31

Promontry (bulge) produced by Cochlea Tympanic Plexus covering Promontry Oval Window Superior to Promontry Round Window Inferior to Promontry Facial Canal (for Facial Nerve) Posterior to Oval Window

Question 32

**Middle Ear** The Medial Wall is also the ...

Answer 32

Lateral Wall of the Internal Ear

Question 33

**Middle Ear** Lateral Wall consist of ...

Answer 33

tympanic membrane

Question 34

**Middle Ear** Contents

Answer 34

Auditory Ossicles (Malleus, Incus, Stapes) Muscles (Tensor Tympani and Stapedius)

Question 35

**Middle Ear** What are the Auditory Ossicles?

Answer 35

3 Interconnected Movable Bones between Tympanic Space and Internal Ear

Question 36

**Middle Ear** Function of the Tympanic Cavity Muscles

Answer 36

Decrease sound intensity before reaching inner ear

Question 37

**Middle Ear** Motor Nerve Supply of Tympanic Cavity Muscles

Answer 37

**Tensor Tympani**: Trigeminal Nerve **Stapedius**: Facial Nerve

Question 38

**Middle Ear** The Eustachian Tube connects the ____ to the ____

Answer 38

__Middle Ear__ __Nasopharynx__

Question 39

**Middle Ear** Eustachian Tube length

Answer 39

36mm

Question 40

**Middle Ear** Eustachian Tube consists of ...

Answer 40

Bony Part (1/3rd) Cartilaginous Part (2/3rd)

Question 41

**Middle Ear** Function of Eustachian Tube

Answer 41

Equalizes pressure across Tympanic Membrane Drains Mucous from Middle Ear into Pharynx

Question 42

**Middle Ear** Eustachian Tube opened during ____ by ____

Answer 42

__deglutition__ __the Tensor Palati and Levator Palati__

Question 43

**Middle Ear** Nerve Supply of Lateral Surface of Auricle

Answer 43

**Upper 2/3**: Auriculotemporal Nerve **Lower 1/3**: Great Auricular Nerve

Question 44

**Middle Ear** Nerve Supply of External Auditory Canal

Answer 44

**Anterosuperior Wall**: Auriculotemporal Nerve **Posteroinferior Wall**: Vagus

Question 45

**Middle Ear** Nerve Supply of the Outer Surface of Tympanic Membrane

Answer 45

**Anterior Half**: Auriculotemporal Nerve **Posterior Half**: Vagus

Question 46

**Middle Ear** Nerve Supply of the Tympanic Cavity and Inner Surface of Tympanic Membrane

Answer 46

Glossopharyngeal Nerve