Term
| during implantation, the inner cell mass of the blastocyst converts to a |
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Definition
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Definition
-embryonic disc
-epiblast (dorsal)
-hypoblast (ventral)
-3 primary germ layers and extra embryoinc membranes develop |
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Definition
-epiblast cells form a transparent sac filled with amniotic fluid
-mantains temp
-fluid comes from maternal blood then fetal urine |
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Definition
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Definition
-sac that hangs from ventral surface of the embryo
-from the hypoblast
-later forms part of digestive tube
-source of earliest blood cells and blood vessels |
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Definition
-a small outpocketing at the caudal end of the yolk sac
-structural base for the umbilical cord (CT)
-becomes part of the urinary bladder |
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Definition
-helps form the placenta
-encloses the embryonic body and all other membranes |
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Definition
-occurs in week 3
-embryonic disc becomes 3 layered embryo (ecto,meso,endoderm)
-rearrangement and migration of cells
-begins with appearance of primitive streak |
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Term
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Definition
-raised dorsal groove that establishes longitudinal axis
-starts at caudal end of embryo
-primitive node at the cranial end of the streak |
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Definition
-cells form from endoderm first
-then mesoderm
-then ectoderm |
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Definition
-rod of mesodermal cells that serve as axial support
-directly below primitive streak |
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Definition
-nervous system
-skin epidermis |
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Term
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Definition
| -epithelial linings of digestive, respiratory, and urogential systems |
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Term
| endoderm and ectoderm considered |
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Definition
-epithelia
-securely joined cells |
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Term
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Definition
| -star shaped cells that are free to migrate in the embryo |
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Term
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Definition
| -3 germ layers and notochord formed |
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Term
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Definition
-all organ systems recognizable
-end of embryonic period |
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Term
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Definition
-neural tube forms
-adjacent cells (crest cells) become cranial, spinal, sympathetic nerves |
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Definition
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Definition
| incomplete closure of neural tube |
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Definition
| 3 brain vesicles apparent |
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Definition
-cerebral hemispheres cover top of brain
-brain waves can be recorded |
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Term
| most of remaining ectoderm forms |
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Definition
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Definition
-lateral folds
-head and tail folds |
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Term
| specialization of mesoderm |
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Definition
-3 mesoderm aggregates appear lateral to notochord
-somites, intermediate mesoderm, lateral plate mesoderm
-occur in segmented pairs |
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Term
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Definition
-sclerotome cells
-dermatome cells
-myotome cells |
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Definition
| -produce vertebra and rib |
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Definition
| form dermis on dorsal part of body |
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Definition
| form skeletal muscle of the neck trunk and limbs |
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Definition
| -forms gonads and kidneys |
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Term
| at the end of embryonic period |
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Definition
-bones begun to ossify
-skeletal muscles are formed
-kidneys are developing
-gonads formed
-lungs/dig organs obtaining final positions
-heart is formed and pumping |
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Definition
| -substances that cause congenital abnormalities |
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Term
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Definition
-fetal alcohol syndrome
-microcephaly, mental retardation, abnormal growth |
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Term
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Definition
| -sedative that treated morning sickness resulted in deformed limbs |
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Term
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Definition
-treats acne
-very strong teratogen
-iPledge program |
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