IVF > Image Database > Anomalies

* For permission to use this image or to obtain a higher quality please contact Prof. Philip J. Chan © Do not reproduce without permission. Description: Human sperm with ring-like appearance. 1. The tail encircles the head. 2. In some sperm, the tip is fused to a pinhead to form "rings". 3. A shorter tail forming a smaller loop resembles the "Dag" axonemal defect. 4. A smaller ring may form with a larger ring. Standard sperm parameters and DNA integrity were normal, no antibodies, but failed sperm penetration assay (hamster test). Ring sperm may be headless senescence sperm after a long abstinence period. Submitted by: Contact Prof. Philip J. Chan Loma Linda University School of Medicine, Loma Linda, California CA92354 Page Views: 1555 Additional photos

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