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A. ROSS, SHEILA CHRISTIE and P. EDMOND

Summary.

Similar ultrastructural defects were found in the spermatozoa of two oligospermic men attending a subfertility clinic.

The majority of spermatozoa had a mid-piece of grossly abnormal morphology and the diameter of the tail was increased, due to an excess of outer-sheath fibres. Extra, as well as missing, axial-filament fibres were also seen. In both cases, only a very small proportion of the spermatozoa were motile.

A testicular biopsy was performed on each man and although the histological appearance was normal, abnormal spermatozoa were seen in thin sections examined by electron microscopy.

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A. ROSS, SHEILA CHRISTIE and M. G. KERR

Summary.

A 38-year-old male with a history of 11 years' involuntary infertility was investigated at a subfertility clinic. Seminal analysis showed a sperm density of 40 to 50 × 106 spermatozoa/ml and 1 to 2% motility. He had a normal male complement of 46 chromosomes and meiotic analysis showed 23 normal bivalents. The testes appeared normal histologically, but in the biopsy specimen abnormal spermatozoa were detected in the seminiferous tubules by electron microscopy. Electron microscope examination showed that 97% of ejaculated spermatozoa were structurally abnormal, with elongation of the mid-piece, absence of an outer sheath on the main-piece and extra axial fibres.