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Onecell Human Ovum
Blastomeric Ovum and Blastocyst
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adjacent aligned amniotic anlage anlagen aorta arch arrows indicate arrows show arrows with base axial process basal basement membrane becomes biodynamic blastem fluid blastocoel blastocyst Blechschmidt blood vessels body wall brain bulge capsule cartilage cartilaginous caudal causes cavity cell aggregations cell limiting membranes chorionic coelomic Convergent arrows cranial densation field dermis developmental movements Diagram differentiation direction distal distusion Divergent arrows dorsal early ectoderm embryo endoderm enlarge entocyst disc epithelial epithelium expanding Figure flattened formation gland growing growth pull growth resistance inner tissue intercellular substance layer lengthens limb anlage limiting tissue longitudinal ment mesenchyma mesoblast metabolic field metabolic movements muscle nerve fibers neural groove neural tube nuclei nutrients occurs osteoblasts ovum periderm pharyngeal arch position pressure restraining function result second month segmentation shape and structure somites spinal cord stage stippled stratum basale stretched stroma subcutis surface growth tendon thickened tion transverse section umbilical vascular ventral yolk sac zone