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MD2S3: Anatomy 203 > External and Middle Ear > Flashcards

External and Middle Ear Flashcards

1
Q

Function of the Ear

A

Hearing
Balance

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2
Q

Divisions of the Ear

A

External Ear
Middle Ear
Internal Ear

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3
Q

All the parts of the ear lie within the …

A

temporal bone of the skull

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4
Q

External Ear
Function

A

Collect and Conduct Sound towards the Middle Ear

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5
Q

External Ear
Parts

A

Auricle
External Auditory Canal
Tympanic Membrane

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6
Q

External Ear: Auricle
Parts of the Auricle

A

Helix
Anti-Helix
Scaphoid Fossa
Concha
Tragus
Lobule

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7
Q

External Ear: Auricle
What is the Helix?

A

Curved Rim of Auricle

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8
Q

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

A

Crus of the Helix

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9
Q

External Ear: Auricle
What is the Anti-Helix?

A

Curved Rim anterior to Helix

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10
Q

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

A

2 Crura

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11
Q

External Ear: Auricle
Scaphoid Fossa location

A

Between Helix and Anti-Helix

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12
Q

External Ear: Auricle
Concha location

A

Anteroinferior to Antihelix

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13
Q

External Ear: Auricle
What is the Tragus?

A

Curved Flap projecting Posteriorly

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14
Q

External Ear: Auricle
Lobule location

A

Lowest Part of Auricle

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15
Q

External Ear: Auricle
Lobule formation

A

Soft Tissue without Cartilaginous Skeleton

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16
Q

External Ear: External Auditory Canal
Extent

A

From External Acoustic Meatus to Tympanic Membrane

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17
Q

External Ear: External Auditory Canal
Shape

A

S-Shaped

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18
Q

External Ear: External Auditory Canal
Parts

A

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

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19
Q

External Ear: External Auditory Canal
Length

A

24mm

20
Q

External Ear: Tympanic Membrane
What is the Tympanic Membrane

A

Oval Disc on the Medial End of the External Auditory Canal

21
Q

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

A

Lateral Wall of the Tympanic Cavity

22
Q

Middle Ear
What is the Middle Ear?

A

Air-Filled, Mucous Membrane-Linked Space

23
Q

Middle Ear
Limited by …

A

Laterally: Tympanic Membrane
Medially: Internal Ear

24
Q

Middle Ear
Function

A

Transmit Vibrations of Tympanic Membrane to Internal Ear

25
Q

Middle Ear
Communications

A

Mastoid Area posteriorly
Nasopharynx via Eustachian Tube anteriorly

26
Q

Middle Ear
Walls

A

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

27
Q

Middle Ear
Anterior/Carotid Wall features

A

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

28
Q

Middle Ear
Posterior/Mastoid Wall features

A

Aditus to Mastoid Antrum
Pyramid gives origin to Stapedius Muscle

29
Q

Middle Ear
Roof/Tegmental Wall features

A

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

30
Q

Middle Ear
Floor/Jugular Wall features

A

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

31
Q

Middle Ear
Medial/Labyrinthine Wall features

A

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

32
Q

Middle Ear
The Medial Wall is also the …

A

Lateral Wall of the Internal Ear

33
Q

Middle Ear
Lateral Wall consist of …

A

tympanic membrane

34
Q

Middle Ear
Contents

A

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

35
Q

Middle Ear
What are the Auditory Ossicles?

A

3 Interconnected Movable Bones between Tympanic Space and Internal Ear

36
Q

Middle Ear
Function of the Tympanic Cavity Muscles

A

Decrease sound intensity before reaching inner ear

37
Q

Middle Ear
Motor Nerve Supply of Tympanic Cavity Muscles

A

Tensor Tympani: Trigeminal Nerve
Stapedius: Facial Nerve

38
Q

Middle Ear
The Eustachian Tube connects the ____ to the ____

A

__Middle Ear__
__Nasopharynx__

39
Q

Middle Ear
Eustachian Tube length

A

36mm

40
Q

Middle Ear
Eustachian Tube consists of …

A

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

41
Q

Middle Ear
Function of Eustachian Tube

A

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

42
Q

Middle Ear
Eustachian Tube opened during ____ by ____

A

__deglutition__
__the Tensor Palati and Levator Palati__

43
Q

Middle Ear
Nerve Supply of Lateral Surface of Auricle

A

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

44
Q

Middle Ear
Nerve Supply of External Auditory Canal

A

Anterosuperior Wall: Auriculotemporal Nerve
Posteroinferior Wall: Vagus

45
Q

Middle Ear
Nerve Supply of the Outer Surface of Tympanic Membrane

A

Anterior Half: Auriculotemporal Nerve
Posterior Half: Vagus

46
Q

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

A

Glossopharyngeal Nerve

MD2S3: Anatomy 203 (31 decks)

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