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Spermatozoa are concentrated immensely in the epididymis - (caput=25 to 50 million vs. cauda=>2 billion) -...

Spermatozoa are concentrated immensely in the epididymis - (caput=25 to 50 million vs. cauda=>2 billion) - and these changes in concentration are the result of rete fluid reabsorption and various epididymal secretions. What makes the cauda epididymal fluid so different than the other segments (Remember the function of the cauda epididymis)?

Science   Anatomy-And-Physiology   
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As the sperms leave the seminiferous tubules they are mixed with dilute secretions of sertoli cells. Rete testis is does a small amount of secretion and reabsorption of fluids and transports the sperms to the efferent ducts which does about 95% of fluid absorption concentrating the fluid as it enters the epididymis. As they enter the caput they are surrounded by intraluminal enviorment conducit for their maturation and reabsorption of fluids continue furthur concentarting the sperms. Usually this lasts for 2-3 days and when the sperms reach the cauda region the sperms motility is supressed which furthur concentrates the sperms and as ejaculation is to occur the sperms are propelled by peristaltic movement and intermixed with prostatic fluid.

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