鹿児島大学 遺伝子実験部門

下記の要領で第24回遺伝子実験施設セミナーを開催します。
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• 日時　8月18日 (火曜日)　午後3時から午後5時まで
• 場所　遺伝子実験施設 1階 セミナー室
• 講演　Special function unit in spermatic cord region
• 講師　Dr. Worawut RERKAMNUAYCHOKE　(タイ王立カセサート大学 獣医学部 准教授)
• 概要

  Testicular artery and vein in the spermatic cord region play a major role in temperature regulation of testis through heat exchange mechanism.
  In addition, counter-current transfer of several kinds of substances,
  especially testosterone hormone, as well as gas between testicular artery and vein in the spermatic cord region has been demonstrated in several kinds of animals including man. Recently, using blood flow method showed blood bypassed the testis between 28 – 46%. Many suggestions were raised to explain this phenomenon, such as, the mechanism may be accomplished by arterio-venous anastomosis in the cord or it may be done by diffusion. In order to fulfill the requirements of the target organs (testis or epididymis), it is considered that the structure of testicular artery and vein in the cord has been modified. However, the morphological architecture which regards to this evidence in the cord has not been fully understood.

  The aims of these studies were designed to evaluate any kind of special function unit that presents in spermatic cord region. Six species of animals, golden hamster, swine, common tree shrew, variable squirrel squirrel, Asian musk shrews and lesser mouse deer, were studied by light and transmission electron microscopies as well as corrosion cast techniques combined with scanning electron microscopy.

  The special function unit was found in spermatic cord region in these studies and could be classified as primary and secondary modifications. The primary modifications were shared characters such as convoluted testicular artery, thinner vascular walls between testicular artery and apposition vein as well as anastomosis between veins. While, the secondary modifications were considered to be species – dependent characters. This secondary modifications contained with vesiculated cells and direct arterio-venous anastomosis between testicular artery and vein in common tree shrew and variable squirrel, vesiculated capillary complex in lesser mouse deer, venous portal system in swine, endothelial bridge of the venous walls as well as abundance mast cells in the base of the protruding venous wall in golden hamster and extratesticular Leydig cell in Asian musk shrew.