Located around the anus, the opening of
the rectum to the outside
of
the body. Peri- is a prefix borrowed from the Greek. It
means "around or
about." So pericardial is around the heart. Perinatal is
around birth. And
periumbilical is around the umbilicus (the belly button).
Peri- is a useful
prefix in anatomy and so is much employed in medicine.
Pericardial fluid is
fluid around the heart. Periaortic lymph nodes are lymph
nodes around the
aorta. A perianal abscess
is an abscess (a local accumulation of pus) that forms next
to the anus
causing tender swelling in that area and pain on
defecation.
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