ORalHisto Quiz3 Flashcards
when does the face and other tissues start to form
4th week (embryonic period)
facial development includes the formations of:
primitive mouth (stomodeum)
mandibular arch
maxillary process
frontonasal process
nose
what week is fetal period
4-12th week
the first event in the development of the face (4th week prenatal)
disintegration of the membrane
what week does the primitive mouth increase in depth and enlarges
4th week
most facial structures develops through
fusion
initially located between these adjacent swellings due to proliferation, differentiation and morphogenesis
cleft/furrow
where is growth initially most rapid
upper face (to keep up with the development of the brain)
forehead ceases to grow at what age
12
the stomodeum is limited in depth by the?
oropharyngeal membrane
what is the temporary structure that separates the stomodeum from the primitive pharynx
oropharyngeal membrane
stacked bilateral swellings of tissue inferior to the stomodeum
pharyngeal arches
how many pairs of pharyngeal arches
6
the pharyngeal arches is covered by?
ectoderm
the pharyngeal arches is lined by?
endoderm
what does the pharyngeal arches support
primitive pharynx
the primitive pharynx is cranial most part of the?
foregut
the primitive pharynx is caudal to the?
stomodeum
what separates the primitive pharynx from the stomodeum
buccopharyngeal membrane
series of mesodermal thickenings appear on the lateral wall
buccopharyngeal membrane
2 bulges of tissue that appear inferior to the primitive mouth
mandibular process
the mandibular process consists of:
mesenchyme (neural crest cells)
the future mandible is formed from?
mandibular processes that fuse to form the mandibular arch
seen at the midline surface of mature bony mandible
mandibular symphysis
this indicates where the mandible is formed by fusion of right and left mandibular processes
mandibular symphysis
the mandibular arch is also considered as?
1st branchial arch
forms within each side of the arch
Meckel’s cartilage
what is it called when most of the cartilage disappears as the mandible is formed
intramembranous ossification
the mandibular arch gives rise to?
lower face (including lower lip)
mandibular teeth
muscles of mastication
tongue
bulge of tissue in the upper facial area
frontonasal process
this process is at the most cephalic end of the embryo
frontonasal process
the cranial boundary of the stomodeum
frontonasal process
the frontonasal process gives rise to?
upper face
forehead
nose bridge
primary palate
nasal septum
medial nasal process
rounded areas of specialized, thickened ectoderm found at the location of the developing special sense organs
placodes
placodes that are located anterior of the frontonasal process
nasal placodes
button-like that later develop into olfactory epithelium
nasal placodes
initially located fishlike on each side of the frontonasal process
lens placodes
when placodes submerge, they form a depression in the center of each placode and becomes?
nasal pit (future nasal cavity)
2 crescent-shaped swellings located between the nasal pits
median nasal process
when the median nasal processes fuse together externally, it forms the?
root to apex of the nose
tubercle of the upper lip
philtrum
what does the 2 medial nasal processes form when they fuse internally
intermaxillary segment
involved in the formation of maxillary incisors, primary palate, and nasal septum
intermaxillary segment
outer part of the nasal pits
lateral nasal processes
the lateral nasal processes forms the?
ala of the nose
adjacent swellings on each side of the stomodeum following the increased growth of the mandibular arch
maxillary processes
true or false:
most processes are formed from mesenchyme provided by the neural crest cells
true
this process will form the midface, sides of upper lip, cheeks, secondary palate, posterior part of the maxilla, canine, posterior teeth, and associated tissue
maxillary processes
fusion of both maxillary processes externally
upper lip
the part where upper lip and lower lip meet
labial commissure
