. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. THE GENITAL ORGANS OF THE MALE. 975 6. The Penis. The penis is the male organ of copulation, and results from the union of the corpus cavernosum and the spongy portion of the urethra. These parts have already been described ; so it now remains to consider the organ in its entirety. The penis commences at the ischial arch, passes between the tliighs and the two dartoid sacs containing the testicles, and is prolonged beneath the belly, where it terminates in a free extremity. All the portion comprised between the
. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. THE GENITAL ORGANS OF THE MALE. 975 6. The Penis. The penis is the male organ of copulation, and results from the union of the corpus cavernosum and the spongy portion of the urethra. These parts have already been described ; so it now remains to consider the organ in its entirety. The penis commences at the ischial arch, passes between the tliighs and the two dartoid sacs containing the testicles, and is prolonged beneath the belly, where it terminates in a free extremity. All the portion comprised between the ischial arch and the scrotum is maintained and deeply covered by the surrounding textures, and is named the /ixetl portion of the penis. The remainder of the organ—its anterior moiety— is, on the contrary, its free portion, as it forms a detached appendage sustained by a cutaneous fold—the sheath {ov prejmce). The Fixed Portion occupies the perinaeal region and that between the thighs, where it is enveloped by the arteries, veins, and nerves ^'S- ^2** already known, as well as by- a large quantity of connective tissue (and the skin). The Free Portion is lodged in the prepuce during the inactive condition of the organ, but pro- trudes from it when in a state of erection. It is then seen to be covered by a smooth, unctuous, tegnmentary membrane with numerous papillse, and of variable colour, though most frequently it is black or variegated. Its base presents a slight circular enlarge- ment, due to the accumulation, beneath the mucous membrane, of a small annular mass of elastic and contractile tissue. Its ex- tremity or (jlans is also a circular enlargement, limited behind by a salient ridge —the corona glandis—which is notched inferiorly, and at the moment of ejacu- lation assumes a considerable development, its shape being then not unlike the rose of a watering-can. This enlargement has for its basis the terminal expansion of the urethral erectile tissue, and presents
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