Webster's New World Medical Dictionary

1
(the oph-
thalmic nerve) and 
2
(the maxillary nerve) of the
fifth cranial (trigeminal) nerve, and the sixth cranial
(abducens) nerve.
cavernous sinus syndrome
A condition char-
acterized by swelling of the eyelids and the conjunc-
tivae of the eyes, as well as paralysis of the cranial
nerves that course through the cavernous sinus. It is
caused by a cavernous sinus thrombosis.
cavernous sinus thrombosis
A blood clot
within the cavernous sinus. A thrombosis in this key
crossroads causes cavernous sinus syndrome.
cavity
See 
caries.
cavity, abdominal
See 
abdominal cavity.
CBC
Complete blood count, a set of values of the
cellular (formed) elements of blood. CBC measure-
ments are usually determined by specially designed
machines that analyze the different components of
blood in less than a minute. The values generally
included in a CBC are the following:
• The number of white blood cells in a vol-
ume of blood. The normal range varies
slightly among laboratories but is gener-
ally between 4,300 and 10,800 cells per
cubic millimeter (cmm).
• The automated white cell differential,
which is a machine-generated percentage
of the different types of white blood cells,
usually split into granulocytes, lympho-
cytes, monocytes, eosinophils, and
basophils.
• Red cell count, which is the number of
red blood cells in a volume of blood. The
normal range varies slightly among labo-
ratories but is generally between 4.2 and
5.9 million cells/cmm.
• The amount of hemoglobin in a volume
of blood. The normal range for hemoglo-
bin is different between the sexes; it is
approximately 13–18 g/deciliter for men
and 12–16 g/deciliter for women (inter-
national units 8.1–11.2 millimoles/liter
for men and 7.4–9.9 millimoles/liter for
women).
• Hematocrit, the ratio of the volume of red
cells to the volume of whole blood. The
normal range for hematocrit is different
between the sexes and is approximately
45 to 52 percent for men and 37 to 48
percent for women.