On the corpuscles of the blood / by Martin Barry. Pts. [I]-III.

  • Barry, M. (Martin), 1802-1855.
Date:
1840-1841
Catalogue details

Licence: Public Domain Mark

Credit: On the corpuscles of the blood / by Martin Barry. Pts. [I]-III. 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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    present paper. And I confirm the statements made on that occasion; namely, that the cells send out processes or arms which interlace; that the contained pellucid object seems to enter into the processes or arms; that it is by a coalescence of the cells that the incipient chorion is formed; that the additions of cells appear to be continued up to the period when villi are produced; and that the villi themselves are probably formed out of the same kind of cells. It remains to add, that the cells in question, delineated in that paper, not merely have the same appearance, but are identical with those in Plate XXIX. fig. 7- of the present memoir: in other words, that the chorion is formed of cells which are altered corpuscles of the blood. 25. In Plate XXIX. fig. 8. are seen some of the very earliest traces of the formation of the chorion. The cells (g1) of the tunica granulosa were described on a former occasionas becoming club-shaped and connected with the membrane f by their pointed extremities alone, after the fecundation of the ovum. Such is the form and position of the cells g1 exhibited, for the most part in outline, in this figure. One purpose answered by the changes just mentioned as presented by the cells g1, seems to be that blood-corpuscles (cho.) find their way between them, and have space for applying themselves to the membrane f while this membrane continues to be pro- tected by those cells];. In fig. 8. several blood-corpuscles (cho.) are seen to have occupied the latter situation, where, in some instances, they appear to effect the alter- ations in their form above described §. Three of them, it will be observed, had become cells, and two were in the same stage as some of those in fig. 7, having begun to send out processes or arms||. 26. For the announcement that the chorion is formed by corpuscles of the Blood, physiologists, I apprehend, are not prepared ; it being the generally received opinion that the formation and the nourishment of organs are effected through its fluid part^[. But the next section records facts which, if established by future observation, involve more important consequences. Muscular Fibre formed of Cells derived from Corpuscles of the Blood. 27- The latest researches, which have been published, on the mode of origin of muscle, are I believe those of Valentin and Schwann. f “ Third Series,” l. c., par. 345. + Which also may afford fluid for the imbibition of the chorion. The protection above referred to is possibly essential during the transit of the ovum into the Fallopian tube. § In other instances those alterations occur before the blood-corpuscles take their places on the ovum. |1 In Insects, a structure supposed to be analogous to the chorion of Mammalia, is often found to present itself in the ovary, and it “not rarely exhibits an elegant delineation consisting of flat coalesced cells.” (R. Wagner, A. Encycl. d. W. u. K. Erste Section, XXXII. “Ei,” p. 4.) IF An eminent physiologist, however, has recently remarked : “ What becomes of the blood-corpuscles,— whether they are transformed,—whether entirely or in part they are here and there deposited,—whether they dissolve, &c. has not been ascertained; we are reduced to mere hypotheses.” (R. Wagner, Beitrage zur vergl. Phys. H. II. S. 54. 4 H MDCCCXL.