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MICROHSB > 2nd semester: Embryology of EAR, NOSE, TONGUE > Flashcards

2nd semester: Embryology of EAR, NOSE, TONGUE Flashcards

1
Q

Internal arises from thickening of surface ______ at level of developing brainstem in myencephalon

A

Ectoderm

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2
Q

Thickening of ectodermal surface -> ______ -> Otic pit

A

Otic placade

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3
Q

What portion will become the membranous labyrinth?

A

Otic vesicle

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4
Q

The Otic Vesicle will have 2 compartments. The VENTRAL component will become the _______

A

A. Saccule [Receptor for STATIC EQUILIBRIUM -> linear motion -> MACULA]
B. Cochlear duct [Receptor for HEARING -> ORGAN OF CORTI]

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5
Q

The Otic Vesicle will have 2 compartments. The DORSAL component will become the _______

A

A. Utricle [saccule w/ macula -> linear motion]
B. Semicircular ducts [receptor for CIRCULAR MOTION -> crista ampullaris]
C. Endolymphatic duct [diverticulum as otic vesicle DISENGAGE from ectoderm]

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6
Q

Middle arises from _____

A

Endoderm [1st pharyngeal pouch]

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7
Q

The 1st phrayngeal pouch is divided into 2. The DISTAL part forms the ______

A

tympanic cavity

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8
Q

The formation of the ossicles and muscles are derived from _____

A

mesoderm

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9
Q

The 1st phrayngeal pouch is divided into 2. The PROXIMAL part forms the ______

A

auditory tube/eustachian tube [connects to the nasopharyngeal part]

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10
Q

The ____ is directly connected to the tympanic membrane while ____ is to the oval window of entry to inner ear

A

Malleus

Stapes

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11
Q

Stapes arises from the cartilage of ______

A

2nd pharyngeal arch

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12
Q

Skeletal muscles and their attachment:
Tensory tympani: ________
________: attached to stapes

A

attached to malleus

stapedius muscle

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13
Q

The eardrum/tympanic membrane is the boundary between ______

A

OUTER and INNER ear

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14
Q

The pinna/auricle is the external portion of the ear.
The pharyngeal cleft -> gives rise to the ____
The pharyngeal arch -> gives rise to ____

A

skin [ectoderm]

elastic cartilage [mesoderm]

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15
Q

The ____ solid component of pharyngeal cleft and will disintegrate. IF NOT, will form congenital conductive deafness.

A

Meatal plug

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16
Q

The ____ will communicate with middle ear through tympanic membrane

A

Meatal plug

17
Q

The eardrum is made of
epithelial lining from -> 1st pharyngeal cleft
endothelial lining from -> 1st pharyngeal pouch
Layer of CT -> ___ and ___ pharyngeal arches

A

1st

2nd

18
Q

The nose arises from ___

A

surface ectoderm

19
Q

When will the nose start to develop?

A

5th week of gestation

20
Q

The developing ____ will eventually become the oral cavity

A

stomodeum

21
Q

The developing telencephalon will become the ______

A

cerebrum

22
Q

nasal placode -> depression -> ___ -> nasal sac -> ______

A

nasal pit

nasal cavity

23
Q

nose: The MEDIAL nasal swelling will become the _____

A

nasal septum

24
Q

The nasal septum will be continuous with ____

A

columella

25
Q

nose: The LATERAL nasal swelling will become ______

A

ALA OF NOSE [nostrils]

26
Q

What is the special type of lining that covers the nasal cavity?

A

Ectodermal epithelium [arises from nasal placode and becomes the olfactory epithelium; olfactory placode]

27
Q

The tongue arises from what germ layer?

A

ENDOdermal layer [1st pharyngeal arch]

28
Q

When does the tongue start to develop?

A

4th week of gestation

29
Q

Tongue: The medial swelling from the 1st phrayngeal arch will become the _______

A

Tuberculum impar

30
Q

Tongue: swellings on the lateral side of tuberculum impar will merge and form the _____ of the tongue

A

Anterior 2/3

31
Q

The point of fusion of the 2 lateral lingual swelling is ______

A

median sulcus of the tongue

32
Q

what are the 5 pharyngeal arches?

A

1,2,3,4,6

no 5 kasi mag disintegrate lang siya or hindi mag develop

33
Q

The posterior 1/3 of the tongue will arise from

A

hypobonchial eminence

34
Q

What is the fate of the 2nd pharyngeal arch associated with the tongue?

A

Capula

35
Q

Majority of the 3rd and 4th pharyngeal arch develops into the

A

hypobranchial eminence [overshadows the capula]

36
Q

Tongue: point of fusion between the anterior 2/3 & posterior 1/3 is a V-SHAPED structure known as

A

Terminal Sulcus

37
Q

What important parts are found in the lingual papillae?

A

Taste buds

38
Q

When does the lingual papillae develop?

A

around 11th to 13th week

MICROHSB (14 decks)

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