<prompt> What is oligospermia?Sperm count 20 million c.mmAbsence of spermsAbsence of semenDecreased spermatogenesis  <response>: Ans: a Sperm count 20 millionc.mm Ref: Bailey, 24th ed,p. 1416; Shaw, 13th ed,p. 202Oligospermia Oligozoospermia- Mild - 10 - 20 million c.mm- Moderate -5-10 million c.mm- Severe - 5 million c.mmAspermia -no semen.anejaculationAzoospermia -no sperm in semenAsthenospermia -no motile sperm or diminished motilityNecrospermia -dead sperms all sperms are nonmotile or nonviableTeratospermia -abnormal morphology of spermsLeucocytospermia -increased white cells in semenOligoasthenoteratozoospermia -sperm variables all subnormalPolyzoospermia -count is more than 350 millionc.mmNormozoospermia -all semen parameters normal 