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FrontalCortex, Inc. is a non-profit corporation dedicated to neurology education.

Gray54.png

uploaded on: Jan 26, 2009
by: jdmiles

Courtesy of Wikimedia Foundation, Inc.

Figure obtained by combining several successive sections of a human embryo of about the fourth week (From Kollmann.) The upper arrow is in the pleuroperitoneal opening, the lower in the pleuropericardial.

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