. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. RODENTIA. 393 the testes are contained, moreover, remarkable for Fig. 281. The testes are tneir great size,. these canals are brought into communication by means of this chamber. In the Alpine marmot, the vesiculae semi- nales contain internally a very complicated cavity, the walls of which are glandular. In the rats, properly so called, the vesicuhe seminales consist of large membranous blad- ders of a flattened conical form, with their inner margins sacculated and uneven, some- thing like a cock's comb. In these animal
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. RODENTIA. 393 the testes are contained, moreover, remarkable for Fig. 281. The testes are tneir great size,. these canals are brought into communication by means of this chamber. In the Alpine marmot, the vesiculae semi- nales contain internally a very complicated cavity, the walls of which are glandular. In the rats, properly so called, the vesicuhe seminales consist of large membranous blad- ders of a flattened conical form, with their inner margins sacculated and uneven, some- thing like a cock's comb. In these animals they are in great part situated out of the pel- vis on account of their very la ge size ; in the hamsters, the voles (Arvicol(i'),the dormice, and the jerboas they present a similar structure, and become remarkably developed during the season for copulation. Fig. 282. ' x « '• u. v. ws ••,( / ]\Iale generative organs of the Hare. a, glans penis; b, body of penis ; c, prostate gland ; d, vesiculae seminales; e, the urinary bladder; f, g, testicles; A, »', epididymis; k, I, the two scrotal pouches; ^>, q, vasa defereutia. which generally exceeds that of the kidneys ; a circumstance which is more remarkably evident during the season of copulation. From the testicles situated as above, the vasa deferentia ascend into the abdominal cavity, along with the spermatic vessels, through the external abdominal ring. In some tribes, a little above their insertion, the walls of the vasu deferentia become manifestly thicker, and the cavity of their duct considerably dilated ; in some cases they join together, and seem to form but one canal; but this appearance is merely external, the ducts continuing separate throughout their whole length. The vcsicu/cE seminales, or their analogues, exist in all the Rodentia. In the hares they are simple bags (fig. 281. d) ; but, generally speaking, their cavity is more or less convo- luted, or branched out into casca, as, for ex- ample, in the
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