The science and art of surgery : being a treatise on surgical injuries, diseases, and operations . always oblique, and takes the courseof tlie spermatic cord ; most commonly descendinginto the scrotum, but sometimes lying within thecanal, out of which perhajjs the testis has imper-fectly passed. This hernia differs from an ordi-nary oblique hernia in the absence of a true peri-toneal sac, and in the protruded parts lying in thetunica vaginalis and in contact with the testicle(Fig. 684). The great peculiarity, indeed, of thishernia, consists in its descending along the canalleft (^i^en by the d
The science and art of surgery : being a treatise on surgical injuries, diseases, and operations . always oblique, and takes the courseof tlie spermatic cord ; most commonly descendinginto the scrotum, but sometimes lying within thecanal, out of which perhajjs the testis has imper-fectly passed. This hernia differs from an ordi-nary oblique hernia in the absence of a true peri-toneal sac, and in the protruded parts lying in thetunica vaginalis and in contact with the testicle(Fig. 684). The great peculiarity, indeed, of thishernia, consists in its descending along the canalleft (^i^en by the descent of the testis. In the foetusthe testis originally lies below the kidney, and, asit descends in the later months of intra-uterine lifeinto the inguinal canal and scrotum, it pulls downa prolongation of the peritoneum, exactly resem-bling a hernial sac. In addition to this defectiveclosure of the vaginal process of the peritoneum, there is another ana-tomical condition which tends to the formation of a congenital inguinalhernia—viz., an abnormally long mesenter3^ This, unlike tlie open. -CongenitalHernia. HERNIA OF THE TUNICA VAGINALIS. 639 peritoneal process, is not necessnrv to the formation of the hernia, butwhen existing it is a material factor in its production. And it is attendedby this serious inconvenience, tliat it is an obstacle to the radical cureof the hernia by the closure of the open funicular process of peritoneumby the pressure of a truss. That prolongation of the peritoneum which is carried down aroundthe testis in its descent, may be divided into two portions, the funicularand the testicular. The fiimcula7^ is that which cori-esponds to the cord,extending from the internal ring to the scrotum; the testicula?is thatwhich becomes the tunica vaginalis. A congenital hernia occurs in con-sequence of the funicular prolongation not becoming, as in the normalcondition, converted into a filamentous fibro-cellular tissue, but remain-ing per\ious, and thus serving
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