This Embryology category includes pages and images that relate to the Pfannenstiel “Klb”. This historic early human embryo was classified as Stage 10 with 5–6 somite pairs occurring during Week 4, GA week 6.
Pfannenstiel “Klb” (originally at Giessen; was in Keibel's Institute at Freiburg i. Br. about 1911, may now be in Berlin). This well known embryo is No. 3 in the Keibel and Elze Normentafel (1908). Models by Kroemer (1903).
A partial set of tracings made by H. M. Evans is in the Carnegie Collection, No. Template:CE5463.
|Stage 10 Links: Week 4 | Gastrulation | Lecture | Practical | Image Gallery | Carnegie Embryos | Embryos | Category:Carnegie Stage 10 | Next Stage 11|
|Historic Papers: 1910 | 1917 | 1926 | 1939 | 1943 | 1957 | 1985|
|Human Embryo Pfannenstiel “Klb”|
|Kroemer-Pfannenstiel. Collection of Prof. Pfannenstiel, Giessen. Carnegie stage 10|
|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|
|3 Human embryo Klb. N.T. Fig. 3a and 3d; Text-fig 5a to 5n.||138 sections of 10 μ = 1.38 mm.||The age is estimated by Born at from 10 to 14 days.||No dorsal bend. Head end bent down at right angles and cut by 24 sections of 10 μ.||Still indications of a neurenteric canal. Short primitive streak. CIoacal membrane.||5-6 pairs of primitive segments.||The chorda throughout is contained in the entoderm.||The medullary canal is everywhere wide open, but the brain portion is aire ady marked off from the cord and shows beginning segmentation.||Optic anlage not yet evident.||Primary pharyngeal membrane No oral sinus.||The 1st branchial pouch is formed but does not reach the ectoderm.||Heart ventral, but still paired. Paired aortse. 1st branchial arch artery. Aa. umbilicales. Yv. omphalo-mesentericae. Vessels on the yolk sack full of blood corpuscles.||No amniotic duct evident.||Allantoic duct||Obtained by laparotomy.|
Kroemer gives the following data: "The greatest length of the embryonic anlage from the anterior edge of the amnion of the head cap to the chorion end of the belly-stalk 1.95 mm, the length of the embryo without the belly-stalk from the head to the tail 1.8 mm., the greatest width of the yolk sack barely 1.2 mm, the width of the embryonic disk at the boundary between the amnion and yolk sack (measured in the head view) 0.9 mm. The measurements of the yolk sack were 1.1 mm, (height), 1.4 mm (width), 1.5 mm. (length)."
Fixation: Mailer's fluid. Stain: alum carmine; paraffin. Sections: 10 micron Transverse
Literature: Pfannenstiel in Handbuch der Geburtshilfe, published by Winckel, Wiesbaden 1903. — Kroemer, Wachsmodell eines jungen menschl. Embryo. Verhandl. d. Ges. f. Gynakologie, 1903. The wide pericardial cavity is not connected with the peripheral ccelom. The embryonic ccelom is being formed caudally. On the chorion the layer of Langhans cells and syncytium.
|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
|1908 Embryo Tables: Klb (stage 10) | Pfannenstiel III (stage 11) | Meyer 300 (stage 12) | Strahl 4mm (stage 13) | Hertwig G31 (stage 14)|
- 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.
- Kroemer P. Wachsmodell eines jungen menschlichen Embryo (Wax model of a young human embryo). (1903) Verb, deutsch. Gesellsch. Gyndkol., Wiirzburg, p. 537.
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Pages in category ‘Pfannenstiel Klb’
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Media in category ‘Pfannenstiel Klb’
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- Keibel Mall 2 521.jpg 1,280 × 586; 106 KB