Report on trichinae and trichinosis / United States Marine Hospital Service ; prepared, under direction of the supervising Surgeon-General, by W.C.W. Glazier.

  • United States. Marine Hospital Service.
Date:
1881
Catalogue details

Licence: Public Domain Mark

Credit: Report on trichinae and trichinosis / United States Marine Hospital Service ; prepared, under direction of the supervising Surgeon-General, by W.C.W. Glazier. 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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    been ejected. The great tenacity with which the male adheres to his place in the intestine, and the vivacity with which the female, already containing spermatic elements, views the approach of the male, shows that coition takes place repeatedly. “ The complete act of copulation I have never observed I neverthe- less have several times found masses of males and females entwined to- gether, slipping over and encircling each other and per- forming a variety of motion. At the same time the poste- rior extremity of the male is stiffened and rhythmically projected and withdrawn, while his anterior extremity and the whole body of the female are very active, often coiling completely and uncoiling. The actions of the male while approaching the female consist in gliding the hind part of his body over the body of the female in a longi- fig. 37.—Posterior tudinal direction, and embracing the latter with the ter- youug“maief h* minal hooks, and when loosened, the cloaca is sometimes n seen to project in the form of a minute bell or bladder, tXrdes^rmind with seminal elements adhering (Fig. 37). aca p^oj'ectod “ The beaks or hooks on the posterior extremity of the (Pagenstecher). male must be developed very rapidly, as they are seldom seen incomplete. Before their appearance the spot where they are to appear becomes thin, and then they are projected forth. When they are seen spread out it indi- cates that the worm is approaching or has performed the act of coition. Sometimes a slit may be distinctly seen on the posterior extremity of the female at the ventral side of the anus, on either side of which is a slightly projecting tubercle, the analogue of the hooks of the male. “ The female organs of genei’ation consist of a single ovary, which is funned during its larval existence; a uterus, which develops from its anterior ex- tremity; a vagina, which is developed independently backwards from the vulva, which already exists on the exter- nal surface. By a constriction between the ovary and uterus they are more perfectly separated than are the testicle and vas deferens, but the uterus merges gradually into the va- gina. After complete development the uterus may be considered as a direct widening of the vagina. The whole series of organs lie in a nearly direct line. “The ovary (Fig. 31 OV) in form and position bears a great similarity to the testicle, but reaches further to the rear—nearly to the rounded ex- tremity of the body—but not so far forward, a large portion of the uterus lying behind the commencement of the stomach. Ihe o\ ules as Claim has correctly observed—are not produced exclusively in the vicinity of the fundus of the ovary, but are formed at one side of its wall in its whole length, where they first appear closely S. Ex. 9 3 rnora-CNd .o. t*. y. Fig. 38.—-Anterior portion of developing va- gina, with vulval opening (Pagenstecher).