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
