oroauricular facial dyosotosis
midface deficiences
treacher collins
mandible hypoplasia and malformed ears
warrdenberg
often 2 diff colored eyes, broad face, pigmentation problems
pharyngeal arches
develop bi-laterally ventral to the neural tube
each arch is a composite finger composed of
mesenchyme and mesoderm and neural crest, ectoderm and endoderm-inside and out
1st arch
forms mandible, malleus, incus of middle ear, sphenomandibular ligament, muscles of mastication, CN V
2nd arch
forms stapes, styloid process of temporal bone, superior portion of the hyoid bone, stylohyoid ligament, muscles of facial expression, CN VII, VIII
3rd arch
inferior body of the hyoid bone, stylopharyngeus,, CN IX
4th -6th arches
forms laryngeal cartilages- thyroid and cricoid cartilages, striated muscle of pharyngeal laryngeal and esophagus, CN X
mouth forms from the
stomidium
foramen cecum
transient structure linked to thyroid gland and thyroglossal duct
T/F - epithemlium comes from the endoderm and ectoderm- independent on the inside of each arch and outside respectively
true
structures inside the arch arise from
mesenchyme or neural crest
neural crest comes from the
ectoderm
neurons that arise from rhombomeres 1-3 contribute to
arch 1
neurons that arise from rhombomeres 4-5 contribute to
arch 2
T/F - 4th arch does not get a contribution from the rhombomeres
True
paraxial mesoderm gives rise to
striated meuscles of the head and neck
cleft lip derives from problems in the
neural crest
ear canal froms from cleft ____
1
cervical sinus
obliterated as clefts disappear
pharyngeal pouches derive from the
endoderm
2nd pharyngeal pouch gives rise to the
palatine tonsils
3rd pharyngeal pouch gives rise to the
Inferior parathyroid glands, thymus,
4th pharyngeal pouch gives rise to the
superior parathyroid glands, Ultimobranchial bodies
Tongue Surface is composed of Arch #’s
1,3,4
CN of ant. 2/3 of tongue
V, VII
CN of post. 1/3 of tongue
IX+X, IX
CN of tongue Musculature
XII
of facial primordia
5
what are Taratogens
Monster causers