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Home > All Images > 1999 > March > 10 Mar 1999

Images Dated 10th March 1999

Choose from 16 pictures in our Images Dated 10th March 1999 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

Sperm and egg Featured 10 Mar 1999 Image

Sperm and egg

Fertilisation. Computer artwork of a human sperm approaching an egg (ovum, top left) just before the process of fertilisation. The sperm has an oval head and a hair-like tail which it beats with a whiplash motion to enable it to swim. The human female usually produces a single large egg from the ovary, while the male releases some 300 million much smaller sperm. The sperm travel through the uterus (womb) and up the fallopian tubes to reach the egg. The sperm must penetrate the egg; this penetration is aided by enzymes contained in the sperm's head. Only one sperm can fuse with the egg nucleus. Fertilisation enables male and female genetic material to be shared