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Flashcards in Embryology Deck (24):
1

How many pharyngeal arches are there?

5

2

How are the pharyngeal arches labeled?

1-4 and 6

3

How are the pharyngeal arches numbered?

1 most superior
6 most inerior

4

What separates pharyngeal arches from each other?

Clefts and pouches

5

Where are clefts found?

Ectoderm/outside

6

Where are pouches found?

Endoderm/inside

7

What forms the core of the pharyngeal arches?

Mesenchymal tissue

8

What runs in pharyngeal arches?

Cartilage
Blood vessels
Nerves
Neuronal crest- bone derived from here

9

What cranial nerves develop in the pharyngeal arches?

V, VII, IX and X

10

What develops from the 1st pharyngeal arch?

Maxilla
Zygomatic
Temporal bone
Incus
Malleus
Mandible
CNV
Muscles of mastication

11

What develops from the 2nd pharyngeal arch?

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

12

What develops from the 3rd pharyngeal arch?

Hyoid
Longitudinal pharyngeal muscle
CNIX

13

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

Laryngeal cartiallage
Pharyngeal constrictors
Cricothyroid
CNX

14

What does the 1st pharyngeal cleft become?

External auditory meatus

15

What does the 1st pharyngeal pouch become?

Middle ear
Tympanic membrane
Eustachian tubes

16

What does the 2nd pharyngeal pouch become?

Palatine tonsils

17

Where does the external auditory meatus develop from?

1st pharyngeal cleft

18

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

1st pharyngeal pouch

19

Where do the palatine tonsils develop from?

2nd pharyngeal pouch

20

What develops from the 3rd pharyngeal pouch?

Inferior parathyroid glands
Thymus

21

Where do the inferior parathyroid glands and thymus develop from?

3rd pharyngeal pouch

22

What develops from the 4th pharyngeal pouch?

Superior parathyroid gland

23

Where does the superior parathyroid gland develop form?

4th pharyngeal pouch

24

At that week do the semicircular canals develop?

6 weeks