A Human Embryo of Carnegie Stage 13

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Hwang, Young-il; Chang, Ka Young
Issue Date
Seoul National University College of Medicine
Seoul J Med 1993;34(2):153-163
Human embryoCarnegie stage
A human embryo obtained from a salpinx resected for the treatment
of an ectopic gestation was serially sectioned and observed. Four chambers of the
heart were well delineated, though not completely separated. The dorsal pancreas
was observed while the ventral pancreas was not yet formed. It was hard to clearly
demarcate the cecal area because of no obvious dilatation. The septum
transversum was nearly completely occupied by the hepatic parenchyme. The gall
bladder-cyctic duct primordium was also observed. The intestine distal to the
duodenum was attached to the posterior body wall by a prominent dorsal mesentery.
The respiratory tree showed primary bronchi, and no mesenchymal differentiation
around the tree was achieved yet. The mesonephric system showed variable
developmental features depending on their location in the body. The
mesonephric duct was already connected to the cloaca, and some localized dilatation
of the duct surrounded by mesenchymal condensation, which would become
the metanephric blastema, foretold the formation of the ureteric bud. The otocyst
had been completely separated from the skin ectoderm and the endolymphatic
duct had begun to form. Eye primordium observed was the optic cup. The well
established lense placode impended to invaginate. Although this embryo showed
a few characteristics of stage 14, it may be reasonable to regard this embryo as
an older member of stage 13, considering the overall developmental status.
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College of Medicine/School of Medicine (의과대학/대학원)Dept. of Medicine (의학과)The Seoul Journal of MedicineThe Seoul Journal of Medicine Vol. 34 No.2 (1993)
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