. The anatomy of the domestic animals. Veterinary anatomy. THE PENIS 581 surface is convex; its lower part slopes backward, and presents a deep depression, the fossa glandis, in which the urethra protrudes for about an inch (ca. cm.) as a free tul)e, tlie urethral process (Processus urethrae), covered by a thin integument. The urethra is thus surrounded by a circular fossa, which opens superiorly into the urethral sinus, a bilocular tiiverticulum lined by thin skin. This diverticulum is filled sometimes with a caseous mass of sebaceous matter and epithelial debris. Behind the corona glandi
. The anatomy of the domestic animals. Veterinary anatomy. THE PENIS 581 surface is convex; its lower part slopes backward, and presents a deep depression, the fossa glandis, in which the urethra protrudes for about an inch (ca. cm.) as a free tul)e, tlie urethral process (Processus urethrae), covered by a thin integument. The urethra is thus surrounded by a circular fossa, which opens superiorly into the urethral sinus, a bilocular tiiverticulum lined by thin skin. This diverticulum is filled sometimes with a caseous mass of sebaceous matter and epithelial debris. Behind the corona glandis there is a constriction, the collum glandis. It is to be noted, however, that this does not indicate the demarcation between the glans and corpus penis, since the former extends backward above the corpus cavernosum a distance of about four inches (ca. 10 cm.), forming the processus dorsalis glandis (Fig. 518). Structure.—The penis consists essentially of two erectile bodies, the corpus cavernosum penis and the corpus cavernosum urethrae. The corpus cavernosum penis forms the greater part of the bulk of the penis except at its free extremity. It arises from each side of the ischial arch by a cms penis, which is embedded in the ischio-cavernosus muscle. Below the ischial arch the crura unite to form the laterally compressed body of the corpus cavernosum; this presents ventrally the urethral Dorsum penis Corpus cavi-rnosum pe?iis Corpus cavernosum urelhrce. Trabeculce Tunica albuginea Urethra Bulbo- cavemosus muscle Retractor penis muscle -Cross-section of Body < groove (Sulcus urethralis), which con- tains the urethra and corpus caverno- sum urethrse. Anteriorly the corpus cavernosum penis divides into three processes—a long central one, which is capped by the glans penis, and two short blunt lateral ones. The corpus cavernosum is enclosed by the tiuiica albuginea, a thick capsule of fibrous tissue which contains some elastic fibers. Externally the fibers are chiefly lon
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphiladelphialondon
