イヌの陰茎の血管系 : 樹脂鋳型法による観察 Penile Vascular System of the Dog. An Injection-Corrosion and Histological Study

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Abstract

イヌの陰茎の血管系をアクリル樹脂鋳型法で立体的に観察した. さらに, 鋳型標本で特微的な部位について, 連続切片により組織学的観察も行った. 注入樹脂の刺激作用により, 坐骨海綿体筋と球海綿体筋が収縮し, 陰茎脚と尿道球が圧縮されており, これらの筋が勃起時に海綿体内圧を維持するためのポンプ効果を持つことが示唆された. さらに, 尿道球の遠部位が外肝門括約筋の圧縮を受けており, 尿道海綿体中の血液が尿道球ヘ逆流しないように作用することが示唆された. 陰茎背静脈も坐骨尿道筋により圧迫され狭窄していた. 陰茎背静脈と尿道球静脈を集める内陰部静脈も肝門挙筋, 尾骨筋および内閉鎖筋により圧迫され狭窄していた. また, 陰茎深静脈, 尿道球静脈および浅亀頭静脈が海綿体から出る部分は極端に細く, "堰 sluice channel"を構成していた. こうした筋の収縮作用や排出静脈の堰構造は, 陰茎勃起時の海綿体洞への血液充満に重要な働きをするものと考えられた.

The vascular architecture of the dog penis was studied by resin casts and histological preparations. Morphological evidence was found for penile engorgement. The crus and the bulb were compressed by the ischiocavernosus and the bulbospongiosus muscles, respectively, indicating that these muscles act as a booster pump. The distal part of the bulb was also strangulated by the external anal sphincter, indicating that this muscle prevents blood in the corpus spongiosum penis from going back into the bulb. The common trunk of the dorsal vein of the penis was significantly occluded by the ischiourethralis muscle. The internal pudendal vein was also throttled by the levator ani, the coccygeus, and the internal obturator muscles. The extremely narrow diameter of each vein draining the erectile body was insufficient to drain the increased blood flow and, therefore, formed a sluice channel. It is inferred that these muscle activities and sluice channels facilitate the erection of the penis.

Journal

  • Japanese journal of veterinary science

    Japanese journal of veterinary science 51(4), 765-773, 1989-08-15

    Japanese Society of Veterinary Science

Codes

  • NII Article ID (NAID)
    110003918047
  • NII NACSIS-CAT ID (NCID)
    AA10521639
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    00215295
  • NDL Article ID
    3249610
  • NDL Source Classification
    RB86(畜産--家畜--犬・猫)
  • NDL Source Classification
    ZR22(科学技術--農林水産--畜産)
  • NDL Call No.
    Z18-350
  • Data Source
    NDL  NII-ELS  IR 
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