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Bio - Reproductive - Gastrulation
Bio - Reproductive - Gastrulation
12
Biology
Graduate
11/01/2011

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Term
Gastrulation
Definition
process that transforms the Blastula into a three-layered structure - completed by the end of the 2nd week after fertilization
Term
Gastrula
Definition
embryo in process of gastrulation
Term
Blastopore
Definition
primitive gut is the only one opening to the outside (becomes either the mouth or anus depending on the group of animals)
Term
Invagination
Definition
pushing in of cells from one end of the Blastula
Term
Involution
Definition
rolling of cells at the blastopore
Term
Ingression
Definition
cells leave an outer layer of cells transforming into freely migrating mesenchyme cells
Term
Epibody
Definition
expansion of one cell sheet over the other
Term
Intercalation
Definition
row of cells moving between one another, creating an array of cells that is longer but thinner
Term
Convergent Extension
Definition
rows of cells intercalate
Term
Ectoderm
Definition
-forms nails, fingernails, teeth, cutaneus glands
-lens of the eye
-nervous system & external sensory receptors: sight, smell, taste, hearing and balance
-lining of the mouth, epithelia of nasal cavity, anal canal, enamel
Term
Endoderm
Definition
-lining of digestive tract from the pharnyx to the anus
-lining of respiratory passages and lungs
-organs such as: stomach, intestines, liver, pancreas and the parathyroid and thyroid gland
-lining of the lower 1/5 of the vagina and lining of the urthera
Term
Mesoderm
Definition
-lining of body cavities
-muscles
-cartilage, bone and blood
-heart, blood vessels
-kidneys
-gonads
-adrenal cortex
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