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etal emissary veins.
-receives arachnoid granulations and drains CSF from the subarachnoid
B. Inferior sagittal sinus
-courses in the inferior edge of the falx cerebr i.
-joins the great cerebral vein to form the straight sinus.
C. Straight sinus
-is formed by the great cerebral vein and the inferior sagittal sinus, -
terminates at the internal occipital protuberance and usually drains into
the left transverse sinus, -drains the superior surface of the cerebellum.
D. Left and right transverse sinuses
-originate at the confluence of the sinuses and course anterolaterally
along the edge of the tentorium cerebelli to become the sigmoid sinus, -
receive venous blood from the temporal and occipital lobe s.
E. Confluence of the sinuses
-lies at the internal occipital protuberance.
-is formed by the union of the superior sagittal, straight, and transverse
F. Sigmoid sinus
—is a continuation of the transverse sinus.
-passes inferiorly and medially into the jugular foramen.
G. Sphenoparietal sinus
-lies along the curve of the lesser wing of the sphenoid bone and drains
into the cavernous sinus.
H. Superior petrosal sinus
-extends from the cavernous sinus to the sigmoid sinu s.
-receives tributaries from the pons, medulla, cerebellum, and inner ea r.
I. Inferior petrosal sinus
-passes between the glossopharyngeal (CN IX) and vagal (CN X) nerves
and drains into the jugular bulb.
-receives major venous drainage from the inferior portion of the cerebellum,
-drains the cavernous sinus and clival plexus into the internal jugular ve in.
ChapterS Blood Supply of the Central Nervous System I 47
J. Cavernous sinus (see Figure 10-3)
-surrounds the sella turcica and the body of the sphenoid b one.
—contains, within the sinus, the internal carotid artery, sympathetic
plexus, and abducent nerve (CN V I).
-contains, within the lateral wall of the sinus, the oculomotor nerve
(CN III), the trochlear nerve (CN IV), the ophthalmic nerve (CN V-l),
and the maxillary branches (CN V-2) of the trigeminal nerve.
-receives blood from the superior and the inferior ophthalmic ve ins.
A. Carotid angiography (Figures 3-6A and B) shows the following arterie s:
1. Internal carotid artery
2. Anterior cerebral artery
3. Middle cerebral artery
B. Vertebral angiography (Figures 3-6C and 3-6D) shows the following
1. Vertebral artery