NDLI: Structure of the intratesticular duct system for sperm emission in the starspotted smooth-hound Mustelus manazo

Content Provider	Springer Nature Link
Author	Park, Jeong Chae Lee, Jeong Hoon Kodama, Keita Urushitani, Hiroshi Ohta, Yasuhiko Horiguchi, Toshihiro
Copyright Year	2012
Abstract	We conducted histological observation of male germ cells and reproductive organs of the starspotted smooth-hound Mustelus manazo in Tokyo Bay to reveal any abnormality in male reproductive traits, as part of a study to elucidate the factors causing recent fluctuation in abundance of the population. Spermatogenesis proceeded in spermatocysts from the germinal zone in the ventral part of the testis to the degenerative zone in the dorsal part, where the spermatozoa were conveyed into the ciliated lumina of the attached terminal branches of the intratesticular ducts. The intratesticular ducts were classified from their terminal ends into branch, stem, and collecting tubules. The ducts formed in the germinal zone and grew as the spermatocysts developed. An opening formed through the wall of each of the most mature spermatocysts into a branch tubule; bundles of spermatozoa were evacuated through this opening into the branch and then the stem tubule and subsequently into the collecting tubules in the rete testis and the efferent duct connected to the epididymis. Spermatocysts that were unable to emit sperm because of failure of adhesion to the branch tubules were disorganized in situ, as were their spermatozoa. The collapsed spermatocysts seem to be cleared by hemophagocytosis with lymphocytes and leukocytes, which may have been recruited from the epigonal organ. There were no specific abnormalities in the spermatogenesis or the morphological structure of testes, which suggested that an abnormality of male reproductive traits was not the major cause of the recent fluctuation in the population abundance of this species. Details of the intratesticular duct system for sperm emission to the epididymis are the first findings in elasmobranchs worldwide.
Starting Page	203
Ending Page	211
Page Count	9
File Format	PDF
ISSN	09199268
Journal	Fisheries Science
Volume Number	79
Issue Number	2
e-ISSN	14442906
Language	English
Publisher	Springer Japan
Publisher Date	2012-12-15
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Elasmobranch Mustelus manazo Intratesticular duct Sperm emission Reproduction Spermatogenesis Tokyo Bay Fish & Wildlife Biology & Management Freshwater & Marine Ecology Food Science
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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