title: Formation of detached tail and coiled tail of sperm in a beagle dog.
abstract: The right testis and epididymis were excised from a Beagle dog that ejaculated high percentages of sperm with detached tails and with coiled tails. Cross sections of the organs were stamped on glass slides and histological examination of the organs was performed to find the portion where sperm with the abnormal tails appear. Many sperm with tails whose axoneme was exposed near the neck region were observed in the testis and they decreased in order from the caput, to the corpus, and the cauda epididymis. Sperm with detached tails and sperm with coiled tails gradually increased in the epididymis. These findings indicate that the tails of sperm with an exposed axoneme detached in the epididymis.
authors.affiliation: Department of Reproduction, Nippon Veterinary and Animal Science University, Kyonan-cho, Musashino-shi, Tokyo, Japan.
authors.forename: Eiichi
authors.initials: E
authors.lastname: Kawakami
authors.forename: Tomomi
authors.initials: T
authors.lastname: Ozawa
authors.forename: Taichi
authors.initials: T
authors.lastname: Hirano
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Hori
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Tsutsui
mesh_terms: D000818:Animals; D004283:Dog Diseases / Q000473:pathology*; D004285:Dogs; D004822:Epididymis / Q000473:pathology; D007248:Infertility, Male / Q000473:pathology / Q000662:veterinary*; D008297:Male; D013082:Sperm Tail / Q000473:pathology*; D013737:Testis / Q000473:pathology