Page 82 - The Miracle of Human Creation

sperm
cell

3) fallopian tube
that seizes the
egg

5) chro-
mosomes
are ex-
changed
and cell
division
begins

4) single sperm
penetrates the
egg membrane
for fertilisation

2) egg bursts from
cyst surrounded
by nurse cells

1) develop-
mental
phases of
the egg

1) Every month an egg is released from the ovaries. 2) The maturated egg breaks the cover-
ing that surrounds it and is released to the pelvic cavity. 3) The egg is intercepted by the fal-
lopian tube making it possible for the egg to be fertilised by the sperm. 4) One single sperm
manages to pierce the membrane and fertilises the egg. 5) The fertilised cells begin to divide
and multiply forming a cluster. 6) At this stage a collection of cells, called a blastocyst, is
formed. This is the first stage in the transformation of cells and the formation of the body's
tissues and organs. 7) The cell cluster reaches the uterus with the help of the fallopian tube.