Embrology Anatomy And Congenital Anomaly Of Ear

Question 1

Period of development of pinnacle

Answer 1

38day to 20weeks

4 - 6th week (adult configuration)

Question 2

Arches of pinna

Answer 2

1 and 2nd arch

Question 3

Six tubercles of pinna develop from

Answer 3

3 from each arch called hillocks of his - mesodermal

Question 4

Process of development of pinna

Answer 4

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

Question 5

Extra edge chondroma arises from

Answer 5

Remnants of notochord

Question 6

Histology appearance of extra edge chondroma

Answer 6

Physaliferous cells

Foamy cells with compressed nuclei

Question 7

Structure of ear fully formed at birth are

Answer 7

Except external ear

Question 8

Day of development of external auditory canal

Answer 8

41day of foetal life

Question 9

EAC develop from

Answer 9

Dorsal end of 1st brachial arch

Question 10

Length of EAC

Answer 10

24mm

Cartilage 8mm

Bony 16mm

Question 11

Fissure present in cartilage of EAC

Answer 11

2 fissure called fissure of santorini

Question 12

Where does wax form

Answer 12

Fissure of santorini because it has ceremonious and pilosebaceous glands

Question 13

Where is foramen of huschke present

Answer 13

Ant inf part of tympanic ring

Question 14

At what age till the foramen of huschke present

Answer 14

Age 4 as Tm develops completely by this age

Question 15

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

Answer 15

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

Question 16

Bony part of EAC is filled by

Answer 16

Membrane

Question 17

Pre auricular sinus

Formation
Opening
Rx

Answer 17

1st abs 2nd hillock

In front of ascending limb of helix

Surgical excision

Question 18

Collateral fistula

Formation

Opening

Answer 18

1st brachial cleft

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

Question 19

Potter syndrome causes

Answer 19

Oligohydraminos

Question 20

Potter syndrome features

Answer 20

Congenital anomaly of pinna
Abnormal limb positioning
Pulmonary hypoplasia
Compression facial

Question 21

Syndromes associated with pinna abnormality

Answer 21

Treacher Collins syndrome

Ladd syndrome

Question 22

Surgical reconstruction of pinna is done at

Answer 22

Age 6

Question 23

Material used for reconstruction of pinna

Answer 23

Rib cartilage

Synthetic implants

Question 24

Exostosis of EAC

Answer 24

Multiple

Associated with cold water swimming

Question 25

Osteoma of EAC

Answer 25

Single and occurs at sutural lines e.g. tympanomastoid

Question 26

Middle ear Develop from Week Parts

Answer 26

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

Question 27

Development of tympanic cavity completed by

Answer 27

30weeks

Question 28

Mastoid pnematization occurs at

Answer 28

33weeks And bulk development in infancy and childhood

Question 29

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

Answer 29

1st year of life 19 yr of life

Question 30

Inner ear develops from | They fuse at

Answer 30

14 ossifying centre | 20weeks

Question 31

Frame work of pinna

Answer 31

Yellow elastic cartilage except lobule

Question 32

Beneath cymba concha lies

Answer 32

MacEwen’s triangle

Question 33

Area used in incision for endurance approach

Answer 33

Incisura terminalis as it is devoid of cartilage

Question 34

``` Uses of auricular cartilage 1 Targus 2 perichondrium 3 fat(lobule) 4 concha ```

Answer 34

Myringoplast & rhinoplasty Myringoplast Myringoplast Rhinoplasty , alar repair

Question 35

Period of development of membranous labyrinth

Answer 35

14th week of IUL

Question 36

Nerve supply of pinna

Answer 36

``` Auricular branch of auriculotemporal Greater Auricular vagus (Auricular branch) Auricular nerve(Auricular branch) Greater Auricular nerve Facial nerve ```

Question 37

Shape of EAC

Answer 37

S shaped

Question 38

Direction cartilage part of EAC

Answer 38

Medially upwards and backwards

Question 39

Deficient part of EAC

Answer 39

Post sup

Question 40

Nerve supply of ant and ant sup wall

Answer 40

Auriculotemporal

Question 41

Nerve supply of floor and post wall

Answer 41

Auricular branch of vagus ( Arnold nerve )

Question 42

Nerve supply of post sup wall

Answer 42

Facial nerve | The fibre of it comes through Arnold nerve

Question 43

Colour of TM | Position at angle of and attained at what age

Answer 43

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