Dural sinuses and veins

Question 1

What veins drain into the Great vein of Galen

Where does it drain to?

Answer 1

The Internal Cerebral Veins and the Basal veins of Rosenthal.

Drains to the Great vein of Galen, aka great cerebral vein (then to the Straight Sinus)

Question 2

List the dural sinuses

Answer 2

Name Drains to
Inferior sagittal sinus: Straight sinus

Superior sagittal sinus: Typically becomes right transverse sinus or confluence of sinuses

Straight sinus: Typically becomes left transverse sinus or confluence of sinuses

Occipital sinus Confluence of sinuses

Confluence of sinuses Right and Left transverse sinuses

Sphenoparietal sinuses Cavernous sinuses

Cavernous sinuses Superior and inferior petrosal sinuses

Superior petrosal sinus Transverse sinuses

Transverse sinuses Sigmoid sinus

Inferior petrosal sinus Internal jugular vein

Sigmoid sinuses Internal jugular vein

Question 3

What drains to the straight sinus?

Answer 3

the inferior saggital sinus and the great cerebral vein of Galen

Question 4

What drains to the confluence of sinuses

Answer 4

The Superior Sagittal sinus
The straight Sinus
The occipital sinus

Question 5

Pachymeninx

Answer 5

Dura mater

Question 6

Leptomeninx

Answer 6

Arachnoid and Pia maters

Question 7

Meninx Primitiva

Answer 7

The embryonic mesenchyme tissue that forms all 3 layers of the meninges.

Derived from both Mesoderm and Neural Crest

Question 8

Pia

Answer 8

Thin, vascular membrane which surrounds the brain tightly.

Mesothelial cells.

Surrounds vessels which penetrate into the brain parenchyma.

Question 9

Tela choroidea

Answer 9

Forms part of the roof of the third and fourth ventricles

Formed by the pia mater

Question 10

Cranial Dura

Answer 10

Dense fibrous connective tissue

TWO TYPES:
ENDOSTEAL Dura,
MENINGEAL dura.

The Endosteal Dura terminates at the foramen magnum and does not continue to the spinal cord.

Meningeal Dura is continuous with the Spinal Dural Sac.
The meningeal dura also follows cranial nerves, and fuses with/becomes epineurium as the exit the skull.

Question 11

Diploic veins

Answer 11

Run from the subarachnoid space inside of the skull to the Superficial fascia layer of the scalp outside of the skull

Question 12

Dural sinus

Answer 12

Space between the meningeal and endosteal layer of dura

Question 13

Subarachnoid Cistern

Answer 13

Very large area of subarachnoid space, in between the arachnoid and pia maters.

Question 14

Cranial epidural space

Answer 14

In the skull, the POTENTIAL space in between the skull and the endosteal dura mater.

Question 15

Other name for Arachnoid granulation (especially large, calcified ones)

Answer 15

Pachionian granulation (increase with age, visible on CT).

Question 16

Spinal epidural space

Answer 16

A REAL/ACTUAL space.

Between the SPINAL DURAL SAC and the ENDORACHIS

Question 17

Denticulate ligament (of spinal chord)

Answer 17

A thickened flat sheath of PIA Mater on both lateral sides of the spinal cord, keeping it suspended in the middle of the dural sac.

Question 18

Epineurium is formed by what CNS derivatives

Answer 18

The Meningeal Dura/Dural Sac and the Arachnoid Mater. By some sources.

Snells also says that the CNS Pia mater surrounds both the cranial nerves and spinal nerves and forms their epineurium.