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BDS2.5 Anatomy > Ear 2 > Flashcards

Ear 2 Flashcards

1
Q

Name the muscle

A

Tensor tympani

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2
Q

What is the action of tensor tympani?

A

Tense tympanic membrane

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3
Q

What is the nerve supply of tensor tympani?

A

CNV3

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4
Q

What is the insertion of tensor tympani?

A

Handle of malleus

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5
Q

What is the origin of tensor tympani?

A

Wall of auditory tube

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6
Q

What muscle is shown

A

Stapedius

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7
Q

What is the origin of stapedius?

A

Pyramid of middle ear

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8
Q

What is the insertion of stapedius?

A

Neck of stapes

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9
Q

What is the action of stapedius?

A

Pull footplate of stapes laterally

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10
Q

What is the innervation to stapedius?

A

CNVII

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11
Q

What is the combined action of stapedius and tensor tympani?

A

Reduce vibration passing to delicate inner ear

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12
Q

What is the sensory nerve supply to the tympanic cavity?

A

CNIX

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13
Q

What is the blood supply to the tympanic cavity?

A

Tympanic branches of posterior Auricular and maxillary arteries

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14
Q

Where does the lymph drain from the tympanic cavity?

A

Retropharyngeal nodes

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15
Q
A

A = auditory tube

B = lateral wall

C = medial wall

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16
Q

What does the auditory tube connect?

A

Nasopharynx with the tympanic cavity (middle ear)

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17
Q

What is the lateral part of the auditory tube?

A

Bony canal lined with mucosa

18
Q

What is the medial part of the auditory tube?

A

Cartilaginous and membranous

19
Q

When is the auditory tube open?

A

She tensor tympani contracts (swallow, yawn etc) lumen opens

20
Q

Describe the pathway of the chords tympani nerve?

A

Arises from facial nerve

Passes to posterior wall of tympanic cavity (middle ear)

Crosses medial surface of tympanic membrane and handle of malleus

Leaves tympanic cavity via petrotympanic fissure in skull

21
Q

What fissure does the chorda tympani leave the tympanic cavity?

A

Via petrotympanic fissure in skull

22
Q

What nerve does chorda tympani join?

A

Lingual to the tongue

23
Q

Apart from the tongue, what does chorda tympani supply?

A

The sublingual and submandibular salivary glands

Parasympathetic secretomotor fibres

24
Q
A
25
Q

What are the 2 parts of the labrynth?

A

Bony

Membranous

26
Q

What lies within the body labyrinth?

A

Membranous labryinth

27
Q

What is the body labryinth?

A

It is the bone which the cochlea lies, it has the same shape which allows the cochlea to fit nicely

28
Q

What is perilymph?

A

Fluid on the inside of the bony labryinth

Conveys the energy that comes through the oval window

29
Q

Name the parts of the bony labryinth

A
30
Q

Where does the perilymph enter and where does it go out of the bony labryinth?

A

In through the oval window

Out through the round window

31
Q

What is the fluid around the bone called compared to inside the bone?

A

Inside the membrane, endolymph

Between the bone and membrane perilymph

32
Q

What contains the receptors which pick up the vibrations?

A

Saccules

33
Q

What is the role of the maculae?

A

Respond to pull of gravity and report on changes of head position

34
Q
A

Semicircular canals

35
Q

What do the bony chambers of the cochlea turn around?

A

Modiolus

36
Q

What do the modiolus contain?

A

Blood vessels and cochlear branches of CNVIII

37
Q

What is this?

A

Cross section of cochlear

3 chambers

38
Q

What is in each chamber of the cochlea?

A

Fluid, convey energy to the nerves etc

39
Q

Name the 3 chambers in the cochlea

A
40
Q

What is the important organ that picks up the sound in the cochlea?

A
41
Q

How does the cochlea conduct signals?

A

BDS2.5 Anatomy (28 decks)

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