[A defect of the head-flagellum-connection of human spermatozoa]

A spermatozoa defect with an obligate heat-flagellum-crack which implies infetility is reported. Hereby the connection of the flagellum with the nucleus is loosened. The axis of the flagellum is displaced from the axis of the nucleus up to 160 degrees. The motility of these spermatozoa is not perceptibly disturbed.