Histo Lec 35: Early Embryonic Development
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37 Terms
1st trimester
during what trimester do craniofacial defects form in utero?
zygote
morula
blastula
gastrula
embryo
what are the 5 steps of development?
cortical reaction
enzymes prevent any other sperm from binding to the egg
polyspermy
the Cortical Reaction blocks:
1st week
when does the Initiation of pregnancy occur?
blastula stage
at what stage does the developing cell implant into the uterus?
gastrulation
the process that the cells in the blastula rearrange themselves spatially to form three layers of cells
caudel to cephalic
in what direction of the bilaminar disc does the primitive streak grow?
epiblast layer
what layer is on the top of the bilaminar disc?
hypoblast layer
what layer is on the bottom of the bilaminar disc?
epiblast layer
the ectorderm originates from the:
ectoderm
the epiblast layer will develop into the:
hypoblast layer
the endoderm originates from the:
endoderm
the hypoblast layer will develop into the:
mesoderm
the cells that invaginate through the primative streak will develop into the:
notochord
The___________ provides support for the embryo and induces the overlying ectoderm to specialize and undergo neurulation
ectoderm
the neural plate forms from what germ layer?
notocord
the vertebral columns develops from the:
vertebrae
the notocord will develop into the:
CNS
the neural tube gives rise to the:
PNS
the neural crest gives rise to the:
folic acid deficiency
Neural tube defects have been associated with:
ectoderm
what is the origin of the enamel?
ectoderm
what is the origin of the oral mucosa?
neural crest
what is the origin of the dentin?
neural crest
what is the origin of the cementum?
neural crest
what is the origin of the dental pulp?
neural crest
what is the origin of the periodontal ligament?
1st pharyngeal arch
which pharyngeal arch originates the maxilla and mandible?
1st pharyngeal arch
the actions of mastication originate from what pharyngeal arch?
2nd pharyngeal arch
the actions of facial expression originate from what pharyngeal arch?
5
how many total processes make up the face?
1
how many frontonasal processes are there?
2
how many maxillary processes are there?
2
how many mandibular processes are there?
trigeminal n.
innervation for 1st pharyngeal arch:
facial n.
innervation for 2nd pharyngeal arch: