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Step 1 Review > Brachial Apparatus High Yield > Flashcards

Brachial Apparatus High Yield Flashcards

1
Q

What are brachial clefts derived from?

A

ectoderm

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2
Q

What do brachial arches arise from?

A

mesoderm (muscles, arteries) and Neural crest (bones, cartilage)

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3
Q

What do brachial pouches arise from?

A

endoderm

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4
Q

External auditory meatus is a derivative of….

A

1st brachial cleft

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5
Q

What allows for a brachial cleft cyst within lateral neck?

A

persistent cervial sinus

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6
Q

Mandible is derived from…

A

1st brachial arch

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7
Q

What are the nerves associated with the 1st brachail arch?

A

V2 and V3

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8
Q

Stapes is derived from…

A

2nd brachial arch

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9
Q

Malleus is derived from…

A

1st brachial arch

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10
Q

Nerves associated with 3rd brachial arch?

A

CN IX

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11
Q

Thyroid cartilage is derived from…

A

4th-6th brachial arches

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12
Q

Nerves associated with the 2nd brachial arch?

A

CN VII

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13
Q

Mandibular ligament is derived from…

A

1st brachial arch

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14
Q

Stylohoid is derived from…

A

2nd brachial arch

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15
Q

Cricoid cartilage is derived from…

A

4th- 6th brachial arch

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16
Q

What nerve is associated with the 4th brachial arch?

A

CN X–> superior laryngeal branch (swallow)

17
Q

What nerve is associated with the 6th brachial arch?

A

CN X–> recurrent laryngeal branch (speak)

18
Q

The intrinsic muscle of the larynx (except cricothyroid) is derived from….

A

the 6th brachial arch

19
Q

The lesser horn of the hyoid is derived from…

A

the 2nd brachial arch

20
Q

The muscles of mastication are derived from…

A

the 1st brahcial arch

21
Q

What is the stylopharngeus muscle derived from?

A

3rd brachial arch

22
Q

What is the tensor tympani derived from?

A

1st brachial arch

23
Q

What is treacher collins syndrome?

A

1st arch neural crest fails to migrate–> mandibular hypoplasia, facial abnormalities

24
Q

Levator veli palatini is derived fro…

A

4th brachail arch

25
Q

What are the oharyngeal constricutors derived from?

A

4th brachial arch

26
Q

What are the muscles of facial expression dervied from?

A

2nd brachial arch

27
Q

Cricothyroid is derived from…

A

4th brachial arch

28
Q

WHat is the middle ear derived from?

A

1st brachial pouch

29
Q

The epithelial lining of the palatine tonsil is derived from…

A

2nd brachial pouch

30
Q

the parathyroids are derived from…

A

interior–> 3rd brachial pouch

superior–> 4th brachial pouch

31
Q

The thymus is derived from..

A

the 3rd brachial pouch

32
Q

The eustachian tube is derived from…

A

1st brachial pouch

33
Q

The mastoid air cells are derived from…

A

1st brachial pouch

34
Q

“T cell deficiency + hypocalcemia + cardiac defects”

A

DiGeorge syndrome (aberrant development of the 3rd and 4th pouches)

35
Q

What pharyngeal pouches are associated with MEN 2A

A

Parathyroid tumor–> 3rd and 4th brachial pouch

Parafollicular thyroid cells (medullary thyroid cancer)–> neural crest cells–> 4th adn 5th pharyngeal pouches

Step 1 Review (62 decks)

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