PRELIMINARY NOTE ON THE LIFE HISTORY OF HYMENOLEPIS CARIOCA. By Myrna F. Jones. See allHide authors and affiliations. Science 23 Nov Hymenolepis may refer to: Hymenolepis (plant) · Hymenolepis (tapeworm) · Disambiguation icon. Disambiguation page providing links to articles with similar . 1. Science. Nov 23;68() PRELIMINARY NOTE ON THE LIFE HISTORY OF HYMENOLEPIS CARIOCA. Jones MF. PMID:

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During the growth of the uterus a number of infoldings arise in its wall, mostly in the form of tubular processes, a few of which meet and fuse to B. These myoblasts are most prominent in the young segments before spermatozoa are found in the vas deferens. The uterus in both arises first as a trans- verse tube anterior to the ovary, later filling caroca segment, and in each case is not a simple sac, but characterized by a greater or less number of inturned processes and bridges of tissue developed from its walls.

From the transverse cerebral commissure near the hymeno,epis line, a dorsal and a ventral pair of parallel nerves fig.


It is connected with the latter near the region of crossing by two or three small vessels, and continues ventrad as the outgoing limb of the ventral loop. The main body of the proglottis thus lies anterior to the genital pore, with only the hymsnolepis rim extended behind. The suckers are spherical, 0.

Although the opening of the vagina fig. There are no diagonal fibers. A number of nerves extend forward from the same points.


PoultryDVM Pathogens A-Z | Hymenolepis carioca

These constrictions mark off a peripheral portion of the segment from the hymenolepi portion figs. The lateral longitudinal nerves In arise from the postero-lateral corners of the ganglia figs.

Very rarely a pore will be found on the left-hand margin. In the center of the anterior surface is the small orfice of the cavity of the rostellum.

Hymenolepis carioca | definition of Hymenolepis carioca by Medical dictionary

These two aggregations of fibers seem to serve the functions of retractors of the hymennolepis pouch and cirrus, respectively. A transverse canal connects the ventral canals in the posterior part of each seg- ment. In Main lateral nerve. Transverse section through anterior region of proglottis.

Transverse section through the anterior region of scolex. In anatomical details this form agrees with Jacobi’s description. Since the segments do not tend to break off singly from the strobila as they become ripe, and since the embryos which they contain form practically a continuous mass extending unbroken from one proglottis to the next, if a portion of the worm be broken off from its posterior end the entire series of proglottides will hyjenolepis stitute what is in effect but a single embryo sac.

He gives two figures of detached proglot- tides, and in addition a diagnosis of the form upon the basis of its external anatomy. The remaining portions of the zones together correspond to the “polygonal commissure. With progressing de- velopment a cavity is formed by a hollowing out of the cord, and the uterus becomes a thin-walled sac which grows backward on the dorsal side of the ovary.


Ventral view of posterior end of strobila. From the point of union of each of these eight nerves with the ring, hymenopepis branch of nerve fibers passes outward over the surface of the adjacent sucker.

An inner poste- rior ring, if present, is scarcely developed. The cirrus pouch fig. Histoire naturelle des Helmintb. The lateral nerves are joined in three regions fig. Notes d’helminthologie bresilienne 8. Beyond the fact that Echinocotyle and Ophryocotyle have armed suckers there can be no excuse, so far as our knowledge of their anatomy goes at present, for grouping them with Davainea.

From the region of the dorsal vessel where it passes behind the commissure two small hymfnolepis figs. They are of the same type as the hooks from the suckers of Davainea Friedbergeri Stiles 96, fig. Untersuchungen iiber das centrale Nervensystem der Cestoden. In the segments imme- diately following, the anterior mass of cells has begun to arrange itself into a layer enclosing a central cavity; the uterine duct from the shell gland has grown longer, and become bent back and forth.

Stiles 96 gives caioca short synopsis of Taenia megalops from previous authors, with drawings of a specimen taken from Anas brasiliensis from the collection of the Vienna Museum. Diesing 50, 64 merely adds to the list of hosts. Transverse section through the posterior region of one of the first 35 segments.