Материал: Kaplan USMLE-1 (2013) - Anatomy

Section Ill • Gross Anatomy

Names of the Major Dural Sinuses

1 . Superior sagittal*

2.Inferior sagittal

3.Straight*

4.Transverse* (2)

5.Sigmoid (2)

6.Cavernous (2)

7.Superior petrosal (2)

* Drain into the confluence of sinuses located at the inion.

Folds (Duplications) of Dura Mater

A.Faix Cerebri

B.Tentorium Cerebelli

Figure 111-6-1 2. Dural Venous Sinuses

Major dural venous sinuses

The major dural venous sinuses are the following (Figure III-6- 12):

•The superior sagittal sinus is located in the midsagittal plane along the superior aspect of the falx cerebri. It drains primarily into the conflu­ ence of the sinuses.

•The inferior sagittal sinus is located in the midsagittal plane near the inferior margin of the falx cerebri. It terminates by joining with the great cerebral vein (of Galen) to form the straight sinus at the junction of the falx cerebri and tentorium cerebelli.

•The straight sinus is formed by the union of the inferior sagittal sinus and the great cerebral vein. It usually terminates by draining into the confluens of sinuses (or into the transverse sinus) .

•The occipital sinus is a small sinus found in the posterior border of the tentorium cerebelli. It drains into the confluens of sinuses.

•The confluens ofsinuses is formed by the union of the superior sagittal,

straight, and occipital sinuses posteriorly at the occipital bone. It drains laterally into the 2 transverse sinuses.

•The transversesinuses are paired sinuses in the tentorium cerebelli and attached to the occipital bone that drain venous blood from the confluens of sinuses into the sigmoid sinuses.

•The sigmoidsinuses are paired and form a S-shaped channel in the floor of the posterior cranial fossa. The sigmoid sinus drains into the internal jugularvein at the jugular foramen.

•The paired cavernous sinuses are located on either side of the body of the sphenoid bone (Figure III-6- 1 3) .

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