01770naa a2200253 a 450000100080000000500110000800800410001910000210006024501140008126000090019552011040020465000100130865000090131865000170132765000100134465000130135465000150136765000100138265000170139265000150140965300150142470000170143977300600145615219832023-12-01       1961    bl uuuu     u00u1 u    #d1 aWAITES, G. M. H.  aRelation of vascular heat exchange to temperature regulation in the testis of the ram.h[electronic resource]  c1961  aAbstract: The blood flowing through the internal spermatic artery of the ram has been shown to cool by 5-2°C (range 4-5° to 5-8°C) between the aorta and the dorsal pole of the testis when testicular temperatures are 33-3° to 34-7°C. Most of the cooling occurs in the coiled portion of the artery in the spermatic cord where the venous blood returning from the testis through the pampiniform plexus warms by a similar amount. It is concluded that the vascular arrangement in the spermatic cord ofthe ram is a remarkably efficient heat-exchange system. The temperature deep in the testis remained close to that ofthe inside of the scrotal skin throughout controlled variations in the range 28° to 40°C. Changes in the temperature of the scrotum are quickly transferred to the blood in the superficial veins ofthe testis which then, by heat exchange in the spermatic cord, alters the temperature of the testicular arterial inflow. It is concluded that the vascular mechanism is not by itself regulatory but it rapidly transfers any benefit of scrotal thermorégulation to all parts ofthe testis.  aMales  aRams  aReproduction  aSheep  aCarneiro  aFisiologia  aOvino  aReprodução  aTestículo  aAndrologia1 aMOULE, G. R.  tJournal Reproduction Fertilitygv. 2, p. 213-224, 1961.