The first sperm to make contact will fertilize the egg. After a perilous journey and against incredible odds, a single sperm attaches to the egg cell membrane. Within a few minutes, their outer membranes fuse, and the egg pulls the sperm inside.
Sciatic pain starts in the lower spine and radiates downward into buttocks, back side of the leg and into the foot. Sciatica typically only affects one side of the body at a time.
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