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ENT > Embryology > Flashcards

Embryology Flashcards

1
Q

How many pharyngeal arches are there?

A

5

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2
Q

How are the pharyngeal arches labeled?

A

1-4 and 6

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3
Q

How are the pharyngeal arches numbered?

A

1 most superior

6 most inerior

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4
Q

What separates pharyngeal arches from each other?

A

Clefts and pouches

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5
Q

Where are clefts found?

A

Ectoderm/outside

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6
Q

Where are pouches found?

A

Endoderm/inside

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7
Q

What forms the core of the pharyngeal arches?

A

Mesenchymal tissue

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8
Q

What runs in pharyngeal arches?

A

Cartilage
Blood vessels
Nerves
Neuronal crest- bone derived from here

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9
Q

What cranial nerves develop in the pharyngeal arches?

A

V, VII, IX and X

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10
Q

What develops from the 1st pharyngeal arch?

A 
Maxilla
Zygomatic
Temporal bone
Incus
Malleus
Mandible
CNV
Muscles of mastication
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11
Q

What develops from the 2nd pharyngeal arch?

A 
Stapes
Temporal bone (styloid process)
Hyoid
CNVII
Muscles of mastication
Stapedius
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12
Q

What develops from the 3rd pharyngeal arch?

A

Hyoid
Longitudinal pharyngeal muscle
CNIX

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13
Q

What develops from the 4th and 6th pharyngeal arches?

A

Laryngeal cartiallage
Pharyngeal constrictors
Cricothyroid
CNX

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14
Q

What does the 1st pharyngeal cleft become?

A

External auditory meatus

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15
Q

What does the 1st pharyngeal pouch become?

A

Middle ear
Tympanic membrane
Eustachian tubes

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16
Q

What does the 2nd pharyngeal pouch become?

A

Palatine tonsils

17
Q

Where does the external auditory meatus develop from?

A

1st pharyngeal cleft

18
Q

Where do the middle ear, tympanic membrane and eustachian tubes develop form?

A

1st pharyngeal pouch

19
Q

Where do the palatine tonsils develop from?

A

2nd pharyngeal pouch

20
Q

What develops from the 3rd pharyngeal pouch?

A

Inferior parathyroid glands

Thymus

21
Q

Where do the inferior parathyroid glands and thymus develop from?

A

3rd pharyngeal pouch

22
Q

What develops from the 4th pharyngeal pouch?

A

Superior parathyroid gland

23
Q

Where does the superior parathyroid gland develop form?

A

4th pharyngeal pouch

24
Q

At that week do the semicircular canals develop?

A

6 weeks

ENT (10 decks)

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