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head and neck ~ anatomy > Middle & Inner Ear > Flashcards

Middle & Inner Ear Flashcards

1
Q

Eustachian tube divided into

A

Bony part ~ 1.2 cm

Cartilaginous part ~ 2.4 cm

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2
Q

Narrowest part of Auditory tube

A

Isthmus

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3
Q

Function of Eustachian tube

A

To equalise the pressure on both side of Tympanic Membrane

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4
Q

Muscle responsible for opening of Eustachian tube

A

Tensor Veli Palatini Muscle

Assisted by Levator Veli Palatini Muscle

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5
Q

Tensor Veli Palatini is also know as

A

Dilator Tubae Muscle

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6
Q

Lateral Wall of Middle Ear ~

Derived from ~

A

Tympanic Membrane

Derived From 1st Pharyngeal Membrane

Made up of all the 3 germ layers

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7
Q

Roof of Middle Ear is Formed By ___________

And is separating Middle Ear from _______

A

Tegmen tympani ~ thin plate of bone

Separates Middle Ear from Middle Cranial Fossa

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8
Q

Floor (Bony plate) of Middle ear is separating from

Floor is pierced by

A

Internal Jugular Vein

Pierced by Tympanic branch of Glossopharyngeal ~ in turn forms Tympanic Plexus

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9
Q

Lower part of anterior wall of Middle ear cavity is relating to

A

Inter Carotid Artery

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10
Q

Upper Part of Anterior wall of Middle Ear Cavity has

A

2 Bony Canals

1st for Tensor Tympani Muscle

2nd for Auditory Tube

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11
Q

Aditus is present in which wall of middle ear cavity

A

Posterior Wall

Through Aditus Middle ear is communicating with Mastoid Antrum

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12
Q

Pyramidal Eminence contains

A

Stapedial Muscle

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13
Q

Structures in Posterior Wall of Middle Ear

A

Aditus

Pyramidal eminence

Bony canal for Facial Nerve

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14
Q

Promontory in the medial wall of middle ear is due to

A

Basal Turn of Cochlea

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15
Q

Tympanic plexus is formed by

Is present over _________

A

Tympanic branch of IX

+

Caroticotympanic Branch (sympathetic plexus over ICA)

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16
Q

Oval window also known as

A

Fenestra Vestibuli

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17
Q

Fenestra Vestibuli is closed by

A

Foot plate of Stapes

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18
Q

Fenestra Cochlea is closed by

A

Fenestra Cochlea / Round Window

Is closed by Secondary Tympanic Membrane

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19
Q

Perilymph is derived from

A

CSF

20
Q

Endolymph is secreted by

A

Stria Vascularis of Cochlear Duct

21
Q

List Bony Labyrinth consists of

A

Cochlea
Vestibule
Semicircular canals

22
Q

Membranous labyrinth present in

Cochlea ~

Semicircular Canals ~

Ventricle ~

A

Cochlear Duct

Semicircular Duct

Utricle and Saccule

23
Q

Centre part of cochlea is called

A

Modiolous

The cochlear canal making 2.5-2.75 turns around the Modiolous

24
Q

Osseus spiral lamina coming from the Modiolous ~

extending into the cochlear canal

And divides cochlear canal into

A

3 Parts;

Scala vestbuli

Scala tympani

Scala media (cochlear duct / membranous labyrinth)

25
Q

Boundaries for Scala Media

A

Above ~ Vestibular Membrane

Below ~ Basilar Membrane

26
Q

At the Apex of Modiolous, the Scala Vestibuli and Scala Tympani communicating with each other is called

A

Helicotrema

27
Q

Perilymph is communicating with the CSF through

A

Aqueduct of Cochlea

28
Q

Inner ear infection is spreading to CNS through which opening

A

Aqueduct of Cochlea

29
Q

Aqueduct of Vestibuli transmit the

A

Endolymphatic Duct

30
Q

Sensory epithelium present in the cochlear duct for hearing is

A

Organ of Corti

31
Q

Peripheral fibres of Spiral Ganglion is innervating the

A

Inner and Outer Hair Cells in Organ of Corti

32
Q

Majority of Peripheral fibres of Spiral Ganglion is innervating the

A

Inner Hair Cell > Outer Hair Cell

33
Q

Central processes of Spiral Ganglion will form

A

Cochlear Nerve

34
Q

Describe Auditory Pathway

E

C

O

L

I

M

A

A

E ~ Eighth nerve

C ~ Cochlear nucleus

O ~ sup. Olivary nucleus

L ~ Lateral Leminiscus

I ~ Inferior colliculus

M ~ Medial geniculate body

A ~ Auditory cortex (ant. part of superior temporal gyrus)

35
Q

Semicircular canals opens into vestibule by means of

A

5 Openings

Semicircular duct opens into the Utricle by means of 5 openings

36
Q

Cochlear duct opening into the Saccule by means of

A

Ductus Reunions

37
Q

Utricle and Saccule joining together and forms

A

Utriculo-Sacculo Duct

Which continue as Endolymphatic Duct

Endolymphatic duct is passing through Aqueduct of Vestibuli

38
Q

Dilation in Endolymphatic Duct is forming

A

Endolymphatic Sac ~ observed between the 2 layers of dura

39
Q

Sensory epithelium present in the Saccule and Utricle is called

A

Maculae

For Static Balance

40
Q

Number of Semicircular Canals

A

3 ~ Anterior, Posterior and Lateral

Anterior and Posterior ~ in vertical axis

Lateral ~ in horizontal axis

41
Q

________________ canal is Perpendicular to Long Axis of Petrous Temporal Bone

A

Anterior Semicircular Canal

42
Q

Posterior Semicircular Canal is ___________ to Long Axis of Petrous Temporal Bone

A

Parallel

43
Q

Angle between each semicircular canal is

A

90 Degree

44
Q

The dilated end of semicircular canal is

A

Ampulla

Each semicircular canal has dilated end and normal end

45
Q

What is Crus Commune

A

One end of anterior semicircular canal joins with one end of posterior semicircular canal

Due to which semicircular canals opens into vestibule by means of only 5 openings

46
Q

Sensory Epithelium in the Semicircular Duct(canal) is called

A

Crista ~ for Kinetic Balance

head and neck ~ anatomy (16 decks)

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