. The comparative anatomy of the domesticated animals. Veterinary anatomy. 866 THE GENERATIVE APPARATUS. ¥is. 403. All the portion comprised between the ischial arch and the scrotum, is maintained and deeply covered by the surrounding textui-es, and is named the fixed 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 slieath (ot prepuce). The Fixed Poetion occupies the perineal region and that between the thighs, where it is enveloped by the arteries, veins, and nerves
. The comparative anatomy of the domesticated animals. Veterinary anatomy. 866 THE GENERATIVE APPARATUS. ¥is. 403. All the portion comprised between the ischial arch and the scrotum, is maintained and deeply covered by the surrounding textui-es, and is named the fixed 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 slieath (ot prepuce). The Fixed Poetion occupies the perineal region and that between the thighs, where it is enveloped by the arteries, veins, and nerves already known, as well as by a large quantity of connective tissue (and the skin). The Feee Portion is lodged in the sheath during the inactive condition of the organ, but protrudes from it when in a state of erection. It is then seen to be covered by a smooth, unctuous tegumentary membrane with numerous papillae, and of variable colour, though most frequently it is black or variegated. Its hase presents a slight circular enlargement, due to the ac- cumulation, beneath the mucous membrane, of a small annular mass of elastic and contractile tissue. Its ex- tremity or glans is also a cii*- cular enlargement limited behind by a sa-lient collar— the corona glandis—which is notched inferiorly, and at the moment of ejaculation assumes a considerable de- velopment, its shape being then not unlike the rose of a watering-can. This en- largement has for its basis the terminal expansion of the urethral erectile tissue, and presents on its anterior face: 1, In the centre, a rounded prominence due to the point of the corpus cavernosum; 2, Beneath this, the urethral tube encircled by a fossa; 3, At the bottom of the fossa, and below the urethra, the orifice of a bilocular cavity—the urethral sinus, which widens at the bottom, and in which accumulates sebaceous matter that sometimes becomes so hard as to prevent the flow of the urine by compressing the tube ; 4, Inferiorly, the sub
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