TSM 1.19 Flashcards

1
Q

how many pharyngeal arches are there in humans?

A

5

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2
Q

what is the first pharyngeal arch divided into?

A

maxillary and mandibular

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3
Q

what does the mandibular and maxillary processes grow and form?

A

semicircular collars

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4
Q

externally what are the pharyngeal arches separated by?

A

pharyngeal clefts/grooves

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5
Q

internally what are the pharyngeal arches separated by?

A

pharyngeal pouches

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6
Q

what are the arches formed by?

A

mesoderm

neural crest ectoderm

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7
Q

what are the ouches formed by?

A

endoderm

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8
Q

which clefts are the cervical sinus?

A

2nd, 3rd and 4th

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9
Q

which clefts are the external auditory meatus?

A

1st

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10
Q

what does the 1st arch membrane form?

A

tympanic membrane

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11
Q

what are in the core of the arch?

A
  • central skeletal rod
  • pharyngeal arch artery
  • neural element
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12
Q

which arch is the trigeminal nerve?

A

1st arch

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13
Q

which arch is the facial nerve?

A

2nd arch

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14
Q

which arch is the glossopharyngeal nerve?

A

3rd arch

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15
Q

which arch is the superior laryngeal branch of vagus nerve?

A

4th arch

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16
Q

which arch is the recurrent laryngeal branch of vagus nerve?

17
Q

what muscles does the 1st arch form?

A

muscles of mastication

18
Q

what muscles does the 2nd arch form?

A

facial expression

19
Q

what muscles does the 3rd arch form?

A

stylopharyngeus muscle

20
Q

what muscles does the 4th arch form?

A

muscle of pharynx and soft palate

21
Q

what muscles does the 6th arch form?

A

muscle of larynx

22
Q

what bones does the 1st arch form?

A
  • bones of middle ear

- mandible

23
Q

what bones does the 3rd arch form?

A

hyoid bone

24
Q

what is the defect in development of 1st arch?

A

treacher collin’s syndrome

25
what bones does teh 2nd arch form?
- stapes - styloid process - stylohyoid ligament - lesser cornu - superior part of hyoid
26
what boens does the 4th to 6th arches form?
neck cartilages
27
what other defects can arch defect cause?
cardiovascular defects
28
what does the 1st pouch form?
middle ear
29
what does the 2nd pouch form?
tonsillar fossa
30
what does the 3rd pouch form?
- thymus | - inferior parathyroid glands
31
what does the 4th pouch form?
- superior parathyroid glands | - ultimobranchial
32
what causes branchial cyst?
failure of obliteration and fluid filling of 2nd cleft/cervical sinus