The embryo produces several membranes that do not
form any part of the new baby but which are necessary to the development and
well being of the embryo. One of these membranes is the amnion, a waterfilled
sac that completely surrounds and protects the embryo. The water absorbs shocks
and prevents friction that might damage the embryo. The implanted embryo is
attached to the uterus by means of the umbilical cord, a structure that contains
blood vessels that function in carrying nutrients and oxygen to the embryo and
transporting wastes away from the embryo. The umbilical cord connects with the
placenta, a vascularized organ made up of tissues of the
mother and
embryo.
