. The comparative anatomy of the domesticated animals. Veterinary anatomy. 854 THE GENERATIVE APPARATUS. border, to the testicular or spermatic cord :^ a thick funiculus contained in the middle portion of the vaginal sheath, and formed by the aggregation of the spermatic vessels with the vas deferens. This cord is itself sustained in the sheath by the frsenum that unites the two serous tunics of that cavity. Structure.—Independently of the serous tunic that covers the exterior of the testicle, there enter into its structure a fibrous membrane^ tissue proper, and vessels and nerves. The excreto
. The comparative anatomy of the domesticated animals. Veterinary anatomy. 854 THE GENERATIVE APPARATUS. border, to the testicular or spermatic cord :^ a thick funiculus contained in the middle portion of the vaginal sheath, and formed by the aggregation of the spermatic vessels with the vas deferens. This cord is itself sustained in the sheath by the frsenum that unites the two serous tunics of that cavity. Structure.—Independently of the serous tunic that covers the exterior of the testicle, there enter into its structure a fibrous membrane^ tissue proper, and vessels and nerves. The excretory duct will be studied separately. Fibrous Membrane.—This membrane, designated the tunica albuginea, forms a strong resisting shell around the testicle, and its texture is channeled by sinuous spaces which lodge the large spermatic vessels. It is covered by the visceral layer of the tunica vaginalis, to which it closely adheres; its inner face sends thin septa into the proper substance of the gland, which divide the latter into the spermatic lobules. Towards the upper border of the testicle, and in front, the tunica albuginea is slightly thickened; this part is named the corpus Higmori (or mediastinum testis), and at this point the seminal ducts pass through it to reach the epididymis. (This membrane is dense and inelastic, being composed of white fibrous tissue interlacing in every direction.) Tissue proper.—The proper substance Fig. 397. of the testicle resembles a greyish-yellow pulp, contained in the tunic albuginea; it is divided by the prolongations which that tunic sends into its interior into small distinct lobules (lobuli testis), independ- ent of each other. These lobules vary in number, from two to three hundred, and all have the same organisation, each being constituted by two or three extremely convoluted filiform tubuli, about from one to two yards in length. These tubes, the tubuli seminiferi, anastomose frequently with each other near their extremi- ties,
Size: 1406px × 1777px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectveterinaryanatomy
