11 & 12 - Embryology of Head and Neck - Stephens Flashcards
condition where there is failure of the occipital and parietal bones to form or close? normally associated with?
cranioschisis; anacephaly (d/t Fetal alcohol syndrome)
what are the weeks of facial development?
5-10
what membrane disintegrates with formation of the nose?
buccopharyngeal
what kind of tissue is the ant 2/3 tongue derived from? innervated?
skin ectoderm; CN V
what kind of tissue is the post 1/3 of tongue derived from?
endoderm
the 2nd branchial arch gives rise to what kind of muscles?
m. of branchiomeric origin; m. of facial expression
what nerve is associated with the 2nd branchial arch?
facial
what m. are from arch 1?
m. of mastication
derivatives of the frontal nasal prominence are innervated by?
V1
maxillary derivatives are innervated by?
V2
mandibular prominence derivates innervated by?
V3
lateral nasal fails to combine with maxillary =
oblique cleft
medial nasal prominence fails to combine with maxillary=
medial cleft lip
what are the weeks for development of palate?
5-12
what form the secondary palate?
palatine shelves
what causes a posterior cleft palate?
failure of palatal shelves don’t come together
what week do the branchial arches form and what controls their induction?
week 4; under induction of migratory neural crest cells
what structures does the first branchial GROOVE give rise to?
tympanic membrane & external auditory meatus (tympanic cavity & eustachian tube)
what nerve is associated with arch 3?
glossopharyngeal nerve
what’s the nemonic Mandalyn taught us?
no nemonic just keep repeating “5, 7, 9, 10” = nerves associated with arches
what muscles come from 4th/6th arch?
pharyngeal and laryngeal mm.
what bones come from arch 1? (main ones high yield or GTFO)
incus, malleus
what skeletal structure arch 2?
stapes
what does the 2nd branchial pouch give rise to?
palatine tonsils
what does the dorsal portion of the 3rd pouch give rise to?
inferior parathyroids
what does the ventral portion of the 3rd pouch give rise to?
thymus
dorsal portion 4th pouch?
superior parathyroids
ventral portion 4th?
ultimobranchial body
if there is a bump on the middle of someone’s throat what should you think?
thyroglossal duct cyst
bump anterior of SCM think?
lateral cervical cyst
what are we gonna do when we get our neuro grades back?
Celebrate, cuz we’re gonna rock this shit!
