Amann R P, Howards S S
J Urol. 1980 Aug;124(2):211-5. doi: 10.1016/s0022-5347(17)55377-x.
Testicular and epididymal spermatozoal reserves were determined for 11 healthy men, a vasectomized man and 12 other men. For healthy men testis weight (19 testes) averaged 16.9 plus or minus 1.2 gm. and daily spermatozoal production was 4.25 times 10(6) per gm. (range equals 1.4 to 6.3 times 10(6) per gm.). Based on our total sample (23 patients) 67 per cent of the men 20 to 50 years old probably produce between 45 times 10(6) and 207 times 10(6) spermatozoa per day. Daily spermatozoal production was normal in 1 vasectomized man. Epididymal reserves of healthy men totaled 182 times 10(6) spermatozoa per epididymis, of which 26 per cent were in the caput, 23 per cent in the corpus and 52 per cent in the cauda. The interval between any previous ejaculation and death was unknown but we assumed that these values are typical for men copulating or masturbating every 1 to 7 days. Extragonadal spermatozoal reserves totaled approximately 440 times 10(6), of which less than 225 times 10(6) would be available for ejaculation in the ductuli deferentia and caudae epididymides. Transit time of spermatozoa through the caput, corpus and cauda epididymidis was estimated as 0.72, 0.71 and 1.76 days. In a vasectomized man extragonadal reserves totaled 7 times 10(9) spermatozoa or about 75 days of production by the testes. Thus, spermatozoal production in man is much less efficient than in other mammals, the extragonadal reserves of spermatozoa are small and maturation of spermatozoa in the caput plus corpus epididymidis occurs in less than 2 days. In terms of these quantitative characteristics the reproductive capacity of man is considerably less than that of a rhesus monkey.
对11名健康男性、1名输精管结扎男性和其他12名男性的睾丸及附睾精子储备进行了测定。健康男性的睾丸重量（19个睾丸）平均为16.9±1.2克，每日精子生成量为每克4.25×10⁶（范围为每克1.4×10⁶至6.3×10⁶）。基于我们的全部样本（23名患者），20至50岁的男性中，67%的人每日可能产生45×10⁶至207×10⁶个精子。1名输精管结扎男性的每日精子生成量正常。健康男性的附睾储备总量为每个附睾182×10⁶个精子，其中26%在附睾头，23%在附睾体，52%在附睾尾。之前任何一次射精与死亡之间的间隔时间未知，但我们假设这些数值对于每1至7天进行性交或手淫的男性来说是典型的。性腺外精子储备总量约为440×10⁶，其中输精管和附睾尾中可用于射精的不到225×10⁶。精子通过附睾头、附睾体和附睾尾的转运时间估计分别为0.72天、0.71天和1.76天。在一名输精管结扎男性中，性腺外储备总量为7×10⁹个精子，约为睾丸75天的生成量。因此，人类精子生成的效率远低于其他哺乳动物，性腺外精子储备量小，精子在附睾头和附睾体中的成熟在不到2天内完成。就这些定量特征而言，人类的生殖能力远低于恒河猴。
