The nasal cavity connects directly to the
nose, but is not part of the sinuses. The
four sinuses each have left and right
halves and are defined as:
# Frontal Sinuses - above your eyes, just
behind the forehead.
# Maxillary Sinus - to the side of the
nose, and below the eye, just above the
upper teeth, below the eyes and in back of
the nose at the top of the throat.
# Ethmoid Sinus - between the eyes
(actually within the spongy ethmoid
bone).
# Sphenoid Sinus - WAY back in the head,
far behind the eyes, above the throat (in
back of the nasal cavity). This sinus is
just forward of the brain case, making
complications here quite serious.
Here's a visual:
http://en.wikipedia.or
g/wiki/Sinus_cavity
Of the four, which one(s) would you say it
is?