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Gastrulation - Anatomy & Physiology (view source)
Revision as of 12:55, 25 August 2008
, 12:55, 25 August 2008→Introduction
| '''Mesoderm'''
| '''Mesoderm'''
|'''Axial Mesoderm''' - Notochord, which is mostly degenerated
|'''Axial Mesoderm''' - Notochord, which is mostly degenerated
'''Paraxial Mesoderm''' - Somites, which form axial skeleton and dermal muscle of the body
'''Paraxial Mesoderm''' - Somites, which form axial skeleton and dermal muscle of the body
'''Intermediate Mesoderm''' - Parts of reproductive system and kidneys
'''Intermediate Mesoderm''' - Parts of reproductive system and kidneys
'''Lateral Plate Mesoderm''' - Heart, limbs, tissue around gut
'''Lateral Plate Mesoderm''' - Heart, limbs, tissue around gut
|-
|-
|Parynx, lungs, liver, lining of gut
|Parynx, lungs, liver, lining of gut
|}
|}
==Mechanism of Gastrulation==
==Mechanism of Gastrulation==
When the embryo is in it's blastula stage it has two cell layers; the epiblast and hypoblast. The epiblast is columnar whilst the hypoblast is cubiodal - each is a single cell thick. '''The epiblast gives rise to all three cell layers; the hypoblast makes no contribution'''. The endoderm and mesoderm develop by proliferation and migration of cells of the epiblast. What remains of the epiblast forms the ectoderm.
When the embryo is in it's blastula stage it has two cell layers; the epiblast and hypoblast. The epiblast is columnar whilst the hypoblast is cubiodal - each is a single cell thick. '''The epiblast gives rise to all three cell layers; the hypoblast makes no contribution'''. The endoderm and mesoderm develop by proliferation and migration of cells of the epiblast. What remains of the epiblast forms the ectoderm.