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7 Cards in this Set
- Front
- Back
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first pharyngeal arch?
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first aortic arch - 1st part of maxillary artery (branch from external carotid)
cleft - develops into external auditory meatus trigeminal nerve - chew (temporalis, masseter, pterygoids, mylohyoid, etc) pouch - middle ear cavity, eustachian tube, mastoid air cells **Treacher Collins syndrome -1st arch neural crest cells fail to migrate -mandibular hypoplasia, facial abnormalities |
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second pharyngeal arch?
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second aortic arch - *stapedial & hyoid artery, but this typically regresses
cleft - 2-4 form temporary cervical sinuses, which are obliterated by proliferation of 2nd arch mesenchyme facial nerve (VII) - smile - mm facial expression, some ear & hyoid assoc structures pouch - epithelial lining of palatine tonsil |
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third pharyngeal arch?
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common & proximal internal carotid arteries
cleft - 2-4 form temporary cervical sinuses, which are obliterated by proliferation of 2nd arch mesenchyme glossopharyngeal nerve IX - parts of hyoid bones, stylopharyngeus mm 3rd pouch -dorsal wings --> inferior parathyroids -ventral wings --> thymus **DiGeorge's syndrome can develop from aberrant development of 3rd & 4th pouches, T-cell deficiency (thymic aplasia) and hypocalcemia (failure of parathyroid development) |
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fourth pharyngeal arch?
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left - first part of true aortic arch
right - subclavian arterie cleft - 2-4 form temporary cervical sinuses, which are obliterated by proliferation of 2nd arch mesenchyme superior laryngeal BRANCH of vagus (X) - simply swallow - mm of pharyngeal constrictors & soft palate, a few of laryngeal mm - CRICOTHYROID 4th pouch - ventral wings develop into SUPERIOR parathyroids **DiGeorge's syndrome can develop from aberrant development of 3rd & 4th pouches, T-cell deficiency (thymic aplasia) and hypocalcemia (failure of parathyroid development) **parafollicular cells (medullary thyroid cancer) derived from neural crest cells, associated w/4th & 5th pouches |
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fifth pharyngeal arch?
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obliterated during fetal development
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sixth pharyngeal arch?
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pulmonary arteries & ductus arteriosus
recurrent laryngeal BRANCH of the vagus nn (X) - speak - most of the mm of larynx (all EXCEPT cricothyroid) pouch - ? |
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tongue development?
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anterior 2/3 - from 1st branchial arch
-sensation via CN V3 -taste via CN VII posterior 1/3 - from 3rd & 4th arch -sensation via CN IX -taste via CN IX (& X at back) Taste - CN VII, IX, X Sensation - CN V3, IX, X Motor - CN XII |
