Oral and Craniofacial Development 2 Flashcards
what does the primary palate form from
intermaxillary segment
what do the palatal shelves form from
maxillary process
fusion of palatal shelves form the:
secondary palate
primary palate fuses with:
secondary palate
what else is forming at the same time of the palate
nasal cavity
areas of specialized thickened ectoderm develop at the surface of the embryo to form what
placodes
the tissue around the nasal placodes undergoes growth, and the placodes become submerged, forming depressions called what
nasal pits
each nasal pit invaginates and expands to form a what
nasal sac
each developing nasal cavity is initially separated from the oral cavity by the primary palate and a piece of tissue called the what
oronasal membrane
rupture of the _______________ opens up and the developing nasal cavities to the developing oral cavity
oronasal membrane
what occupies the developing nasal cavity
tongue
after rupture of the oronasal membrane, the developing tongue occupies the what
primitive nasal and oral cavities
the oral and nasal cavities become separated by the what
palate
while the palate is fusing, what else is also developing
nasal septum
the nasal septum grows down from the ___________ and fuses with the palate
roof of the nasal cavity
the nasal septum divides the nasal cavity into what
right and left sides
the mandible and maxilla are derived from neural crest cells from the ______________
first branchial arch
begins during the embryonic period and continues through childhood and adolescence
ossification
the jaw develops mostly by what
intramembranous ossification
bone tissue replaces a hyaline cartilage template of the bone-to-be
endochondral ossification
bone forms within mesenchyme without replacing a cartilage template
intramembranous ossification
the mandible develops from the _____________ of the first branchial arch
mandibular process
what is bone formation associated with
meckel’s cartilage
inferior alveolar nerve
developing teeth
muscles of mastication
formed by neural crest cells in branchial arch 1
meckel’s cartilage
branches of ________ grow right next to meckel’s cartilage
CN V3
what does CN V3 divide into between the posterior 1/3 and the anterior 2/3 of meckel’s cartilage
lingual branch and inferior alveolar branch
anteriorly, the inferior alveolar branch divides into what
mental branch and incisive branch
formation of the __________ occurs lateral to meckel’s cartilage
mandible
starts within each mandibular process near the split of the inferior alveolar nerve into the mental and incisive branches
ossification
bone will develop lateral to and around meckel’s cartilage _____________
anteroposteriorly
the ________ eventually encloses the meckel’s cartilage and most of the cartilage degenerates
bone
the bone will also eventually enclose the ___________ and most of the ____________
incisive nerve
inferior alveolar nerve
the pattern of ossification produces the _____________ through which the mental nerve passes
mental foramen
the bilateral centers of ossification will remain separated until they fuse at the ____________ until shortly after birth
mandibular symphysis
ossification will continue posteriorly until it reaches the point where the CN V3 branches into _________ and ______________ nerves. here the _______ will form
lingual and inferior alveolar nerves
ramus
secondary centers of ossification contribute to the formation of all parts of the __________
mandible
most of meckel’s cartilage will degenerate but the posterior part will remain to form the ________ and _______ of the inner ear
incus and malleus
the maxilla develops from the _____________ of the first branchial arch
maxillary process
bone formation is associated with what
infraorbital nerve
developing teeth
nasal septal cartilage
ossification begins at the termination of the __________ superior to the area where the primary maxillary canines will develop
infraorbital nerves
ossification then spreads from these primary centers, and merges with ______________ of ossification that arise in different parts of the bone-to-be
secondary centers
each ___________ starts as a groove on the nasal aspect and does not fully develop until after birth
maxillary sinus
