In the course of the sixth week, close to each of the first two pharyngeal arches, three auricular hillocks develop 15.They delimit the external auditory canal 17. The mesonephrogenic prominence 16 forms and indicates the location of the future uro-genital system. During the sixth week a small intestinal loop invades the extraembryonic coelom and into the proximal section of the umbilical cord ...
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