Sperm or spermatozoa


Sperm or spermatozoa


       Mature sperm is minute in long shape. There are three parts of its body-head, neck and tail. Its head is in ovule shape and there is a membrane of enzymes in the shape of cap on its frontal portion and by this cap the sperm gets entry into the ovum of woman. There is a nuclei in the middle of head in which there are chromosomes. There is a thin membrane at the middle of neck behind the head in which there are spiral mitochondria which provide energy for its movement. The tail is a very thin and long formation at the back side of the neck and the sperm marches forward by swimming here and there in the sperm fluid with its help. This capacity of swimming is called motility which is very necessary for man fertility.       

       Sperms are men reproductive cells produced from the seminiferous tubules. Its length from the frontal portion of the head to the last portion of the tail is 0.5 ml (5 micron). Each sperm takes two months’ time in getting mature. 

       Generally, 300 to 500 million sperms are released in one time ejaculation. If the numbers of sperms are below than 20-30 million, such persons are infertile in producing child and this stage is called oligospermia. The condition in which there is complete lack of sperms is called azoospermia. Sexually transmitted diseases can be the cause of azoospermia which is because of the obstruction in the production of sperms or in the disease as mumps in which the internal membrane of seminiferous tubules gets destroyed.

     Sperms keep on producing in the ductus epididymis continuously but they get maturity in the epididymis.