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.

    15/26 (page 7)
    ill consequence, therefore, here the normal uninjured pure nu- cleated crescent form of differentiating erythrocyte. Fig. 3.—The normal non-nucleated crescent form of erythro- cyte, found in another blood vessel of the chorion of a 7-8th week ovum.; another type of intra-blood-vessel-differentiation. Note the delicate nucleus, apparently just extruded into the hollow of the crescent. Fig. 4.—The normal cup-shaped crescent erythrocyte, found in the Area Vasculosa of a 7-8th week human ovum. The meshes of a delicate arachnoidal tissue is shown here, in which, are seen this cup-shaped crescent; a large cell with several nuclei to the left, as though amitosis in intention and ready for division, mulfiplica- tion, and differentiation; into several offspring, one offspring for every nucleolus. Many neonate young erythrocytes are also seen fhroughout this area, extending in large numbers and in many columns of pure unmixed erythrocytes, throughout this area and into contiguous areas. This area, in toto, seems a finishing area in blood corpuscle differentiation. For only here in this area and at this time, are the young pure non-nucleated erythrocytes .seen in large numbers and in long columns; on the contrary, in the blood ve.ssels of its chorion and villi, the erythrocwtes ajipear only occa- sionally; the pure erythroblast still predominating in those vessels. In a most interesting blood corpuscle study by Victor E. Emmel in his article on “Erythroblasts, in the membranes of ])ig em- bryo”; Amer. Jour. Anat., Vol. 16, 1914, he ])re.sented a .series of blood corpuscle illu.strations, picturing changes from the ery- throblast to the erythrocyte in the membranes of pig embryo. The.se findings are all the more remarkable and interesting as they are the results from experimental effort in artificial induction of blood corpuscle differentiations from the erythrobla.st to the ei-yth- roeyte, in the pig embryo. He was very successful, for he pro- duced exact changes in foians in differentiations that occur from the erythroblast to the erythrocyte in the human ovum, from the r)-8th week; intra and extra nteilne. Emmel’s plates and figures are presented herewith in part, with a personal discu.ssion not Prof. Emmel’s text. Fig. o.—Plate 1, Fig. 4, .shows an example of what Emmel (-alls a cup-.shaped erythrocyte; another one above it. The.se seem but another form of the true crescent ty]ie of the erythroblast divi- sion, the form of crescent without the ba.se of the cu]i; as shown