abnormal sperm motility abnormal hyperactivated sperm motility any anomaly in the type of sperm motility that is observed in most sperm recovered from the site of fertilization and is thought to help sperm detach from the oviductal epithelium, reach the site of fertilization, and penetrate the cumulus and zona pellucida of the oocyte; normally, once sperm from most species become hyperactivated, the flagellar beat becomes asymmetrical and higher amplitude, resulting in circular or figure-eight trajectories MP:0009281 MPheno.ontology