Phospholipids are molecules made of
glycerol bound to two long molecules of
fatty acids and to one phosphate group.
Therefore, phospholipids are
amphi molecules, i.e., they have a
non-polar portion, due to the long fatty
acid , and a portion, due to
the group phosphate.

Phospholipids are the main component
of cell membranes. Sphingo, the
substance that forms the myelin sheath
of in the nervous system,is a
too.