豚精巣中に見出された多頭精子

抄録

A Hampshire boar produced an unique form of abnormal spermatozoa (Kojima: 1973), and the boar's testes produced multiple-headed sperm were post mortem investigated histologically. The morphological alterations of the testes were generally hyperplasia of the interstitial tissue and hypoplasia of the seminiferous tubules. The degenerative changes consisted of various kinds of atrophy in the germ cells and disintegration of spermatozoa in the lumen of the seminiferous tubules. With frequent appearance of multinucleated giant cells, there were obviously noticed multiple-headed spermatozoa and also late spermatids in the seminiferous tubules. It is interesting that the multiple headed-spermatozoa were already in existence in the testes. A case of double headed-spermatozoa was also noticed in the interstitial space.