Aortic Arch/Branchial Cleft Derivatives Flashcards Preview

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Flashcards in Aortic Arch/Branchial Cleft Derivatives Deck (18)
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1

1st Aortic Arch

Maxillary artery (branch of external carotid)

2

2nd Aortic Arch

Stapedial and hyoid artery

3

3rd Aortic Arch

Common carotid artery
Proximal part of internal carotid

4

4th Aortic Arch

L: aortic arch (L recurrent laryngeal nerve loops around)
R: proximal part of R subclavian a (right recurrent laryngeal nerve loops around)

5

6th Aortic Arch

Proximal part of pulmonary a (L only)
Ductus arteriosus

6

Branchial Clefts

Ectoderm

7

Branchial Arches

Mesoderm (muscles, arteries)
Neural crest (bones, cartilage)

8

Branchial Pouches

Endoderm

9

1st Branchial Cleft

External auditory meatus

10

2nd-4th Branchial Clefts

Temporary cervical sinuses --> obliterated by proliferation of 2nd arch mesenchyme
BRANCHIAL CLEFT CYST (lateral, immobile)

11

1st Branchial Arch

C: maxillary process (maxilla, zygomatic), mandibular process (meckel cartilage --> mandible, malleus, incus, sphenomandibular ligament)
M: muscles of mastication (temporalis, masseter, lateral/medial pterygoids), mylohyoid, anterior belly of digstric, tensor tympani, tensor veli palatini
N: CNV2 and V3 (mandibular and maxillary branches of trigeminal)
- Pierre Robin Sequence
- Treacher Collins Syndrome

12

2nd Branchial Arch

C: Reichert cartilage (stapes, styloid process, lesser horn of hyoid, stylohyoid ligament)
M: muscles of facial expression, stapedius, stylohyoid, platysma, posterior belly of digastric
N: CNVII (facial)
- Pierre Robin Sequence
- Treacher Collins Syndrome

13

3rd Branchial Arch

C: greater horn of hyoid
M: stylopharyngeus
N: CNIX (glossopharyngeal)

14

4th Branchial Arch

C: arytenoids, cricoid, corniculate, cuneiform, thyroid
4th M: most pharyngeal constrictors, cricothyroid, levator veli palatini
6th M: all intrinsic muscle of larynx except cricothyroid
4th N: CN X (superior laryngeal)
6th N: CN X (recurrent laryngeal)

15

1st Branchial Pouch

Middle ear cavity
Eustachian tubes
Mastoid air cells

16

2nd Branchial Pouch

Epithelial lining of palatine tonsil

17

3rd Branchial Pouch

Dorsal: inferior parathyroids
Ventral: thymus
- DiGeorge

18

4th Branchial Pouch

Dorsal: superior parathyroids
Ventral: ultimobranchial body, parafollicular (C) cells of thyroid
- DiGeorge