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260 ANAT03IY.

The Oircniar Sinus is situated around the pituitary body within the
sella turcica. Its lateral portions communicate with the right and left
cavernous sinuses, while its anterior and posterior portions have received
the name of anterior and posterior intercavernous sinuses. They are
not constant in their existence, one or both being sometimes absent.
Fig. 114.

LONGITUDINAL SINUS

OPTIC NERVE
OPHTHALMIC VEII

SPHENO-PARIETAL
SINUS

CIRCULAR SINUS
CAVERNOUS SINUS
ANTERIOR OCCIPITAL
SINUS
SUPERIOR PETROSAL
SINUS
INFERIOR PETROSAL
SINUS

POSTERIOR OCCIPITAL

LATERAL SINUS
TORCULAR HEROPHILl

LONGITUDINAL SINUS

The 'Miuises ol the Diua M Occasionally there is a third conununicating sinus in this situation.
When this is the case it passes under the ]iituitary body.
The Superior Fefrosdl Siiim is a small canal which commences at the
postei'ior and lateral ])ortion of the cavernous sinus, passes outward and
backward along a groove situated on the ridge between the anterior and
posterior surfaces of the petrous portion of the tem]>oral bone, and
within the attached margin of the tentorium cerel)elli, and terminates
by emptying into the lateral sinus as tliis large canal passes downward
in the sigmoid groove between the mastoid and petrous portions of the