BIOL 1082 Lecture Notes - Lecture 26: Zona Pellucida, Amniotic Sac, Neural Crest

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22 May 2018
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Gastrulation
Embryogenesis
Cleavage- splitting without growth
Zona pellucida- thick outer membrane surrounding ovum before implantation
Compaction- cells get closer together
Differentiation- being able to tell cells apart
Trophoblast- cells on outside
Cavity- blastocoel
Entire thing- trophoblast, blastocoel, inner cell mass= blastocyst
Amniotic cavity develops
Gastrulation
Formation of the three layers
Invagination through primitive groove
Ectoderm
Mesoderm-bone, muscle, pleura, parietal lining of body cavity, urogenital organs, CT
Endoderm lining of internal organs, GI tract, airways---notochord (induces neurulation)
Neurulation
Final stage
Mesoderm- further differentiation of cells; cord formed
Thickening of ectoderm
Invagination of ectoderm to become neural tube
Neural crest cells
Somites
Neural tube becomes CNS
Organogenesis
Process by which the 3 germ layers form many of the organs and structures found in the
adult individual
Ectoderm
Mesoderm- bone is a type of CT
Endoderm
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