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ANAT 1502 Embryology Chapter 6 - CH 6 Organogenetic Period...

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CH. 6 Organogenetic Period: Human Development during Weeks 4-8 - All major internal and external structures are established - By the end all the main organ systems have begun to develop - By end of 8 th week embryo had distinct human appearance. - Exposure to teratogens – drugs/viruses can cause abnormalties Folding of the Embryo - Flat trilaminar disc folds medially and horizontally into a tube shape - Significant in establishing future body form - Results from the rapid growth of brain and spinal cord - Ventral folding of cranial and caudal ends causes cranial and caudal end to move ventrally Head and Tail Folds - Septum Transversum (heart, pericardial cavity, and oropharyngeal membrane) moves ventrally - Longitudinal folding part of endoderm of yolk sac foregut - Cloacal membrane folds hindgut cloaca Lateral Folds - Result from rapid growth of spinal cord and somites - Lateral folds fold medially cylindrical embryo - Endoderm germ layer midgut
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