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Pg Ent > Embrology Anatomy And Congenital Anomaly Of Ear > Flashcards

Embrology Anatomy And Congenital Anomaly Of Ear Flashcards

1
Q

Period of development of pinnacle

A

38day to 20weeks

4 - 6th week (adult configuration)

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2
Q

Arches of pinna

A

1 and 2nd arch

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3
Q

Six tubercles of pinna develop from

A

3 from each arch called hillocks of his - mesodermal

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4
Q

Process of development of pinna

A

The tissue condensation of the mesoderm of the 1st and 2nd branchial arch from 6 hillock of his which fuse to from pinna

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5
Q

Extra edge chondroma arises from

A

Remnants of notochord

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6
Q

Histology appearance of extra edge chondroma

A

Physaliferous cells

Foamy cells with compressed nuclei

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7
Q

Structure of ear fully formed at birth are

A

Except external ear

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8
Q

Day of development of external auditory canal

A

41day of foetal life

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9
Q

EAC develop from

A

Dorsal end of 1st brachial arch

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10
Q

Length of EAC

A

24mm

Cartilage 8mm

Bony 16mm

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11
Q

Fissure present in cartilage of EAC

A

2 fissure called fissure of santorini

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12
Q

Where does wax form

A

Fissure of santorini because it has ceremonious and pilosebaceous glands

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13
Q

Where is foramen of huschke present

A

Ant inf part of tympanic ring

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14
Q

At what age till the foramen of huschke present

A

Age 4 as Tm develops completely by this age

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15
Q

Important of fissures of santorini and foramen of huschke (infections)

A

Infections from mastoid and parotid can pass into each other through these

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16
Q

Bony part of EAC is filled by

A

Membrane

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17
Q

Pre auricular sinus

Formation
Opening
Rx

A

1st abs 2nd hillock

In front of ascending limb of helix

Surgical excision

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18
Q

Collateral fistula

Formation

Opening

A

1st brachial cleft

Upper part : floor of EAC
Lower part : b/w angle of mandible and sternocleidomastiod muscle

19
Q

Potter syndrome causes

A

Oligohydraminos

20
Q

Potter syndrome features

A

Congenital anomaly of pinna
Abnormal limb positioning
Pulmonary hypoplasia
Compression facial

21
Q

Syndromes associated with pinna abnormality

A

Treacher Collins syndrome

Ladd syndrome

22
Q

Surgical reconstruction of pinna is done at

A

Age 6

23
Q

Material used for reconstruction of pinna

A

Rib cartilage

Synthetic implants

24
Q

Exostosis of EAC

A

Multiple

Associated with cold water swimming

25
Q

Osteoma of EAC

A

Single and occurs at sutural lines e.g. tympanomastoid

26
Q

Middle ear

Develop from
Week
Parts

A

1st pharyngeal pouch and dorsal end of 2nd pouch
4th week
Epi, Meso and hypo tympanum

27
Q

Development of tympanic cavity completed by

A

30weeks

28
Q

Mastoid pnematization occurs at

A

33weeks

And bulk development in infancy and childhood

29
Q

Mastoid process develop at …………. and continue to grow up to

A

1st year of life

19 yr of life

30
Q

Inner ear develops from

They fuse at

A

14 ossifying centre

20weeks

31
Q

Frame work of pinna

A

Yellow elastic cartilage except lobule

32
Q

Beneath cymba concha lies

A

MacEwen’s triangle

33
Q

Area used in incision for endurance approach

A

Incisura terminalis as it is devoid of cartilage

34
Q 
Uses of auricular cartilage 
1 Targus 
2 perichondrium
3 fat(lobule)
4 concha
A

Myringoplast & rhinoplasty
Myringoplast
Myringoplast
Rhinoplasty , alar repair

35
Q

Period of development of membranous labyrinth

A

14th week of IUL

36
Q

Nerve supply of pinna

A 
Auricular branch of auriculotemporal
Greater Auricular 
vagus (Auricular branch)
Auricular nerve(Auricular branch)
Greater Auricular nerve
Facial nerve
37
Q

Shape of EAC

A

S shaped

38
Q

Direction cartilage part of EAC

A

Medially upwards and backwards

39
Q

Deficient part of EAC

A

Post sup

40
Q

Nerve supply of ant and ant sup wall

A

Auriculotemporal

41
Q

Nerve supply of floor and post wall

A

Auricular branch of vagus ( Arnold nerve )

42
Q

Nerve supply of post sup wall

A

Facial nerve

The fibre of it comes through Arnold nerve

43
Q

Colour of TM

Position at angle of and attained at what age

A

Pearly white
55 to the floor 40 to 50 angles with the ant wall and
This angle is attained at 4 to 5 years of age

Pg Ent (1 decks)

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