Balaenoptera spp.の乳腺及び卵巣についての組織学的研究―1 : 東海産長須鯨の乳腺について

• Main Author: 水江 一弘
• Format: Report
• Language: Japanese
• Published: 長崎大学水産学部 1958
• Subjects: Cornu; Balaenoptera physalus; Fin whale
• Online Access: http://hdl.handle.net/10069/31875; https://nagasaki-u.repo.nii.ac.jp/?action=repository_uri&item_id=7053; https://nagasaki-u.repo.nii.ac.jp/?action=repository_action_common_download&item_id=7053&item_no=1&attribute_id=18&file_no=1

1) The mammary glands of fin whales in the Eastern Sea were collected and their histological sections were observed. 2) As the whaling season in the Eastern Sea is summer and the whaling ground is distant from the coastal station, the samples are not fresh as compared with that of factory ship. And the mammary gland at a brief period in a sexual cycle of fin whales was collected, as the whaling season is very short. 3) From the histological viewpoint of the mammary gland of fin whales in this season in the Eastern Sea, the females show the following eight stages of maturity. (1) Immature whales There is no corpus luteum and corpus albicans in ovary. The colour of mammary gland is white or light pink and it is 2mm. -3cm. thick. The greater part of the range of vision in histological low power is occupied by the interlobular connective tissue and the little immature lobules are found here and there. In high power the alveolo-tubular end piece closes in the mass of epithelium or alveoli. (2) Whales which experienced ovulation but not pregnancy The mammary gland has equal histological contents to those of immature whales but there is a corpus albicans in ovary, and it is supposed that the whale arrives at the biological minimum and that corpus albicans was grown by ovulation but not by pregnancy. The colour and thickness of mammary gland is equal to those of the immature whales, too. (3) Whales in their first pregnancy As the foetus has been flowed out, the accurate pregnant period can not be concluded from its body length, but judging from the length and diameter of uterine cornu and the season of the catch, it is supposed that the whale goes past the middle stage of pregnancy. By the histological observation of the mammary gland the whale in this stage is equal to the immature whale and itis guessed that the mammary gland in whales is not developed at the first and middle stages , bu tdeveloped rapidly at the last stage of pregnancy and it is different from the case of human being s.The colour and thickness of ...