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PRECURSORS OF BRAIN AND SPINAL CORD, SOMITES (chicken embryo, 36 hours of incubation)      Stained with haematoxylin 1 - precursor of the brain 2 - precursor of spinal cord 3 - somites (primitive segments) 4 - paraxial mesoderm
GERM LAYERS      Stained with haematoxylin 1 - neural tube 2 - notochord 3 - somite (paraxial mesoderm) 4 - intermediate cell mass of mesoderm 5 - somatic layer of mesoderm (a part of lateral mesoderm) 6 - splanchnic layer of mesoderm (a part of lateral mesoderm) 7 - ectoderm 8 - entoderm 9 - celom (body cavity)

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