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Unformatted text preview: ganglia, adrenal medulla & some connective tissues o specialization of endoderm : o edges of endoderm fuse around part of yolk sac forming tube called primitive gut , which forms epithelium of GI tract o mucosae of respiratory tract form from foregut (pharyngeal endoderm) o thyroid, parathyroid & thymus form from pharyngeal endoderm & liver & pancreas arise from midgut (intestinal mucosa) o specialization of mesoderm : notochord develops into vertebral column somites : series of paired block of mesoderm around notochord sclerotome : produces vertebra & rib dermatome : helps form dermis of skin myotome : forms skeletal muscles intermediate mesoderm : forms gonads & kidneys lateral mesoderm: somatic mesoderm : helps form dermis, parietal serosa & bones, ligaments & dermis of limbs splanchnic mesoderm : forms heart, blood vessels & most connective Tissue Page3...
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- Fall '10