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19 Cards in this Set
- Front
- Back
- 3rd side (hint)
These three germ layers give rise to all the tissues and organs of the adult.
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Ectoderm =
Mesoderm = Endoderm = |
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►The primitive streak
Gives rise to |
Notochord
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Embryonic Period is characterized by:
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Formation and differentiation of three germ layers
↓ ▪Appearance of primitive streak ↓ ▪ Somite formation ↓ ▪Development of notochord ↓ ▪Neural tube and Neural crest formation ↓ ▪Completion of chorionic villi formation |
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Some mesenchyme forms mesoblast (undifferentiated mesoderm), which forms =
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the intraembryonic, or embryonic mesoderm
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Mesenchymal cells derived from the primitive streak migrate widely.
These pluripotential cells have the potential to proliferate and differentiate into diverse types of cells, 3ct H+ |
fibroblasts,
chondroblasts, osteoblasts . |
3 blasts
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Cells of the epiblast, through the process of gastrulation, give rise to all
3 germ layers = |
ectoderm,
intraembryonic mesoderm, endoderm |
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The term INTRAembryonic mesoderm describes the germ layer that forms during week
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wk 3
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the EXTRAembryonic mesoderm, which formed during week
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wk 2
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EXTRAembryonic mesoderm is involved in ________? formation =
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placenta
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INTRAembryonic mesoderm forms various=
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tissues and organs found in the adult,
What tissue forms this in the embryo? |
Intraembryonic mesoderm
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Paraxial mesoderm is a thick plate of mesoderm located on each side of the midline.
Paraxial mesoderm becomes organized into segments known as = |
somitomeres,
which form in a |
craniocaudal sequence.
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determining age of the embryo is done how =
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number of somites
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The number of somites is one of the criteria for determining =
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age of the embryo.
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Intermediate mesoderm : is a longitudinal dorsal ridge of mesoderm located between the paraxial mesoderm and lateral mesoderm. =
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This ridge forms the urogenital ridge
, which is involved in the formation of the future = |
kidneys and gonads.
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notochord has a number of important functions
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-ectoderm to differentiate into
neuroectoderm to form the neural plate. -It induces the formation of each vertebral body. -It forms the nucleus pulposus of each intervertebral disk. What forms these? = |
notochord
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The notochordal process grows
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cranially
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Caudal to the primitive streak there is a circular area-the cloacal membrane, which indicates the future site of the
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anus
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-Ectoderm
into -Neuroectoderm into -Neural plate. -Vertebral body formation . -Nucleus pulposus What forms these = |
NOTOCHORD
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Formation and differentiation of three germ layers
↓ ▪Appearance of primitive streak ↓ ▪ Somite formation ↓ ▪Development of notochord ↓ ▪Neural tube and Neural crest formation ↓ ▪Completion of chorionic villi formation |
3 germ layers
↓ primitive streak ↓ ▪ Somite formation ↓ ▪Development of notochord ↓ ▪Neural tube and Neural crest ↓ ▪chorionic villi |
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