Difference between revisions of "Category:Meyer 300"
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Latest revision as of 08:32, 14 November 2018
|Human Embryo No. 300|
|Collection of Professor R. Meyer, Berlin. Carnegie stage 12|
|Desig.||Size||Age||Body form||Primitive streak||Primitive segments||Chorda||Nervous system||Eye||Ear||Nose||Hypophysis||Mouth||Digestive trac, liver and pancreas||Branchial pouches, threoid thymus, trachea and lungs||Urogenital system||Heart and vessels||Integument||Skeleton||Extremities||Amnion||Allantois||Remarks|
N.T. Fig. VI 1, VI r ind VI v.
|Gr. L. 2.5 mm.||Remains of primitive streak. Cloacal membrane.||23 pairs of primitive segments.||Chorda separated from entoderm,||Anterior neuropore closed. but its position still recognizable. Medullary canal stili wide open for a stretch caudally. Roof of 4th vent, beginning to thin out. Neuromeres. Trigeminus and acustico-facialis ganglia distinct.||Optic vesicles. Mesoderm between ectoderm and optic vesicle,||Auditory vesicle almost closed (open through 4 or 5 sections of 5μ). Ductus endolymphaticus not yet visible.||Anlage doubtful.||Pharyngeal membrane just torn, still abundant remains of it.||Intestine still communicates widely with the yolk sack. Liver a thick-walled sack from which the trabeculse are beginning to bud.||The 3 anterior branchial pouches reacts the ectoderm; the 4th, though formed, does not. Thyreoidea mediana formed. Pulmotracheal groove. The paired condition of the pulmonary anlage already indicated.||Rudimentary "pronephric anlage"||Heart S-shaped.||Allantoic duct||The embryo was obtained by operation.|
Abundant mitoses in the embryo. Fixation: ? Stain: Borax carmine. Sections: 5 μ. The embryo was modelled by Dr. Peter Thompson (1907) Also see Meyer (1904)
|Reference: Keibel F. and Elze C. Normal Plates of the Development of the Human Embryo (Homo sapiens). (1908) Vol. 8 in series by Keibel F. Normal plates of the development of vertebrates (Normentafeln zur Entwicklungsgeschichte der Wirbelthiere) Fisher, Jena., Germany.|
Cited in: 1912 Human Embryology and
Thompson P. Description of a human embryo of twenty-three paired somites. (1907) J Anat Physiol, 41(3):159-71. PMID 17232726; Meyer, Rob., Ueber die Beziehung der Umierenkanalchen zum Coelomepithel, etc., Anat. Anz., Vol. 25, 1904
|1908 Embryo Tables: Klb (stage 10) | Pfannenstiel III (stage 11) | Meyer 300 (stage 12) | Strahl 4mm (stage 13) | Hertwig G31 (stage 14)|
Fig. 317. Pharynx of the embryo Meyer 300 (Normentafel Xo. 7, 23 pairs of primitive segments, 2.5 mm vertex-breech length) seen from the ventral surface. The closing membranes of the gillclefts are outlined in black.
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