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(a) Rabbit epididymis ligated 12 days previously in the lower part of the corpus epididymidis. Note the distended tubules proximal to the point of ligation. (b) Distended tubules in the initial segment of the caput epididymidis 12 or more days after ligation of the low corpus region. Spermatozoa released from these tubules were often highly motile but could not fertilize oocytes; nor did they display the tendency for head-head agglutination seen typically in mature spermatozoa.
