The crescent forms of the erythrocyte in normal and pathologic blood expressions : origin of red blood corpuscle and blood plasm / by Frank A. Stahl.

  • Stahl, Frank August, 1862-
Date:
[1887?]
Catalogue details

Licence: Public Domain Mark

Credit: The crescent forms of the erythrocyte in normal and pathologic blood expressions : origin of red blood corpuscle and blood plasm / by Frank A. Stahl. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    thelia is only transitory, that the secondary permanent red cells are extra va.scular in origin. These happy i:)redictions were anticij)ated and Yerified in tlie human, in 1902 and 1900, both articles with illustrations being l)resented in the i\jiier. Jour. Obstet. In tlie.se articles, “Origin of blood corimscles” in the human, was shown to lie in the chorion of the ovum. The Interpretations promi.sed in 1906: “Further details will be presented in a future article, entitled, ‘Origin of the Red-Blood Plastid’ in which article it will be shown that the origin of the blood plastid lies not ‘in the proliferation cff endo- thelia; or in the intracellular connective ti.s.sue cell; or in the medulla of the bone;’ the three popular theories for the origin of the non-nucleated red blood corpuscle,” (Stahl). Blood Islands and Yolk Sac theories will not be touched u])on here, except to incpiire, are not both .sub.sequent to primal l)lood corpuscle? DESCRIPTTYI-:. Fig 1.—The normal nucleated pure crescent form of erythro- cyte found in the blood vessel of a 7-8th week human ovum. This crescent occurs nucleated and non-nucleated. This is the first of the crescents found in the blood ves.sels of the chorion. The similiarity in form and outline of this normal type crescent shaped erythroc3’te, to the pathologic t.vpe shown b.v Minot and Lee, in Fig. 7, is readily' seen. Fig. 2.—Enlargement of the nucleated crescent ervthroeyte .seen in Fig. 1. The thought had occurred that possibly- a .section of a large erythroblast cell slightly curved upon itself, might have resulted in this picture; but the large nucleus, just before and resting against the arch of the crescent, interposes between sec- tioning knife and crescent, leaving a clear interval between knife and cre.scent, preventing and ruling out such a probable result; Explanations of Figukes 5 and 6. Fig. 5.—Illustration not text taken from Emmel, Plate 1, Fig. 4. Cup-shaped crescent forms of erythrocytes; from experiments with membranes of pig embryo. Blood corpuscle differentiation from erythroblast to erythrocyte. Similarity to Fig. 4, above, human cup-shaped crescent, 7-8th week, easily seen. Fig. 6.—Illustrations not text from Plate 5, Figs. 42-43-44, Emmel. Experi- ments pig embryo. A—The dumbbell-shaped erythrocyte; a case of amitosis. The same form exists in a blood vessel of the chorion in the human, 7-8th week. B—43-44—Cre.scent-shaped erythrocytes; pig embryo. The same forms are