Buccopharyngeal membrane

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Buccopharyngeal membrane

Human embryo about fifteen days old. Brain and heart represented from right side. Digestive tube and yolk sac in median section. (Buccopharyngeal membrane labeled in upper left.)
Gray's	subject #6 47
Dorlands/Elsevier	m_08/12522482

Over the crescentic masses of the mesoderm the ectoderm and endoderm come into direct contact with each other and constitute a thin membrane, the buccopharyngeal membrane (or oropharyngeal membrane), which forms a septum between the primitive mouth and pharynx. In front of the buccopharyngeal area, where the lateral crescents of mesoderm fuse in the middle line, the pericardium is afterward developed, and this region is therefore designated the pericardial area.

Embryology at UNC hednk-020a

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Mammalian development of embryo and development of fetus (some dates are approximate - see Carnegie stages)