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periods of prenatal development
proliferative period (first 2 weeks) embryonic period (2- weeks) fetal period (8 weeks-birth) TERM 2
proliferatice period
DEFINITION 2 first 2 weeks fertilization implantation embryonic disk forms TERM 3
embryonic period
DEFINITION 3 2-8 weeks tissues and organs begin heart develops & beats at 4 weeks face and oral structures and 4-7 weeks TERM 4
fetal period
DEFINITION 4 8 weeks-birth tissues differentiate & function growth TERM 5
week 1
DEFINITION 5 sperm meets egg DNA meets cell divides turns into a morula reaches and implants into uterus
blastocyst
hollow with inner cell mass embryoblast w/ trophoblast lining TERM 7
ectoderm
DEFINITION 7 AKA epiblast layer by the amniotic cavity will form epithelium and CNS will form neuroectoderm which forms the neural plate TERM 8
endoderm
DEFINITION 8 AKA hypoblast by the yolk sac form a tube (GI tract) TERM 9
what pinches off to form CNS?
DEFINITION 9 neural groove TERM 10
mesoderm forms
DEFINITION 10 muscles skeleton dermis (made from somites) blood cells makes 38 pairs of somites on each side of CNS
glands and teeth are made up of?
dermis and epidermis TERM 17
CT proper develops from
DEFINITION 17 somites as fibroblasts TERM 18
cartilage
DEFINITION 18 also from somites formed by: appositional (exogenous) growth- new layers interstitial (endogenous) growth- proliferation and expansion of cells in matrix TERM 19
cartilage embryology
DEFINITION 19 migrate from sclerotome to make spinal column chondroblasts form cartilage in appendages, cranium, and face during 5th week TERM 20
bone formation
DEFINITION 20 endochondral- diaphysis calcifies and disintegrates leaving a marrow space and cartilage disk/epiphyseal line/metaphysis intramembranous-matrix calcifies (forms facial bones)
