Comparative Morphological Studies of the Male Genital Organs in Japanese Serow (Capricornis crispus) and the Domestic Goat

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  • ニホンカモシカ(Capricornis crispus)の雄の生殖器の形態学的研究,とくにヤギとの比較
  • ニホン カモシカ Capricornis crispus ノ オス ノ セイシ

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Abstract

The male genital organs of ninety-eight Japanese serows from Ina and Kiso of Nagano Prefecture were anatomically investigated, especially compared with those of the domestic goat. The nomenclature of the male genital organ was referred to the Nomina Anatomica Veterinaria Japonica (1981). 1. The male genital organs of the Japanese serow and the goat consist of the testis, epididymis, deferent duct, spermatic cord, vesicular gland, prostate gland, bulbourethral gland, male urethra, penis, prepuce and scrotum. We observed the morphological differences of the male genital organs between Japanese serow and the goat as follows. 2. Testis : The testis of the Japanese serow is elongated, oval in shape (6.0 cm. long, 4.0 cm. wide) and that of the goat is more spherical (9.0 cm. long, 7.0 cm. wide). In the parenchyma of the testis of the Japanese serow, the mediastinum testis is shorter and thinner than that of the goat. 3. Epididymis : Apart from smaller size, the epididymis of the Japanese serow resembles that of the bull. The head of the epididymis of the goat is well developed, thick and wide as compared with that of the Japanese serow. The body of the epididymis of the Japanese serow somewhat obliquely descends against the long axis of the testis. The tail of the epdidiymis of the goat remarkably projects below as compared with that of the Japanese serow. 4. Deferent duct: The length of the deferent duct of the Japanese serow (33.0 cm. long, 1 mm. in diameter) is shorter than that of the goat (41.0 cm. long, 1 mm. in diameter). The terminal part of the deferent duct increases in diameter and forms the ampulla in the Japanese serow (3 mm. in diameter) and the goat (8 mm. in diameter). However, since the ampulla of the Japanese serow is thinner than that of the goat and gradually increases in diameter, it is somewhat indistinctive. 5. Accessory genital glands: The vesicular gland of the Japanese serow is flat in shape and relatively small, while that of the goat is shaped like a bunch of grapes. The cross section of the disseminate part of the prostate gland was wide oval in the Japanese serow and was nearly round in the goat. The bulbourethral gland of the Japanese serow was much smaller than that of the goat. 6. Penis: Conspicuous characters in the penis of the Japanese serow were observed. The penis of the Japanese serow never have a sigmoid flexure which is the peculiar character in the domestic ruminants and pig. The free part of the penis in the Japanese serow is flat in shape and taper off. Namely, in the goat and sheep the terminal portion of the penis presents an elongated round glans and a twisted urethral process on left side beyond of the glans, while the portion of the Japanese serow divides two parts to a very small pointed glans (ca. 3.0 mm. long, 2.0 mm. wide) dorso-medianly and a very short urethral process (ca. 2.0 mm. long) ventro-medianly beyond of the glans. 7. Scrotum: The scrotum of the Japanese serow is smaller than that of the goat. In external appearence of the scrotum, the location of the epididymis of the Japanese serow is indistinct. However, it is clear in the goat for the sake of the remarkable projection of the tail of the epididymis. 8. Muscles of the male genital organ: The ischiourethralis of the Japanese serow originates from the ischiatic arch and ends on the ventro-lateral surface of the bulb of the penis. This muscle is similar to that of the bull. In the goat, it originates from the tuber ischiadicum and ends on the dorsal surface of the bulb of the penis, blending here with the surface of the bulbospongiosus. In the Japanese serow, the retractor penis is thin, white tendinous, which originates from the lateral surface of the rectum and ends on the distal part of the penis. 9. Weight of testis: The weight of testes of the Japanese serow (left: 34.9 g., right: 35.0 g.) are extremely lighter than those of the goat (left: 135.5 g., right: 129.3 g.). In adult of the Japanese serow, it shows a tendency to decrease from November to March.

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