NEUROANATOMY - Venous Sinuses Flashcards

1
Q

Where does the superior sagittal sinus lie?

A

Between the inner dura and outer endosteum and runs above the falx cerebri

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2
Q

What is the route of the superior sagittal sinus?

A

Begins above foramen caecum, runs between layers of falx cerebi, and becomes continuous with transverse sinus (dilation at this point is called confluence of sinuses).

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3
Q

What does the superior sagittal sinus contain?

A

Contains arachnoid villi through which CSF is absorbed into the bloodstream

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4
Q

What is the route of the straight sinus?

A

Located where falx cerebri meets tentorium cerebelli.

Formed from inferior sagittal sinus and great cerebral vein, it runs backwards to drain into the transverse sinus at the internal occipital protuberance.

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5
Q

What is the route of the inferior sagittal sinus?

A

At the lower margin of the falx cerebri, it runs backwards to join the great cerebral vein to form the straight sinus

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6
Q

What are the paired venous sinuses? (6) What are the unpaired venous sinuses? (5)

A

UnPaired (midline):
* Superior sagittal sinus
* Inferior sagittal sinus
* Straight sinus
* Occipital sinus
* Intercavernous sinus

Paired
1. Transverse
2. Sigmoid
3. Cavernous
4. Superior Petrosal
5. Inferior Petrosal

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7
Q

What is the route of the transverse sinus?

A

Right and left transverse sinus formed at the confluence from superior/inferior sagittal and occipital. Pass along border of tentorium cerebelli along inner surface of occipital bone –> at border of temporal bone (petrous part) becomes the sigmoid sinus.

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8
Q

What is the difference between the right and left transverse sinus?

A

Right is typically continuous with superior sagittal and left is continuous with the straight sinus.

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9
Q

What is the route of the occipital sinus?

A

smallest venous sinus and situated at inner surface of occipital bone. Forms at edge of foramen magnum and drains into confluence of sinuses at internal occipital protuberance.

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10
Q

What is the route of the sigmoid sinus?

A

Continuation of transverse sinus at petrous part of temporal bone.

Take an S shaped course along temporal and occipital bones and pass through jugular foramen to become internal jugular veins

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11
Q

What is the route of the occipital sinus?

A

Small sinus attached at the margin of falx cerebeli and drains into the confluence of sinuses

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12
Q

Where is the cavernous sinus situated?

A

Middle cranial fossa within the body of the sphenod bone and sella turcica. Extends from superior orbital fissure anteriorly to apex of temporal bone posteriorly.

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13
Q

What does the cavernous sinus drain from and then drain into?

A

Drains from superior and inferior ophthalmic vein, inferior and superficial middle cerebral vein and sphenoparietal sinus and drains into superior and inferior petrosal sinuses (posteriorly) and pterygoid plexus (inferiorly)

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14
Q

What is the intercavernous sinus?

A

Connects the two cavernous sinuses - usually two channels either side of the pituitary stalk.

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15
Q

What are the borders of the cavernous sinus?

Anterior? Posterior? Medial? Lateral? Roof? Floor?

A

Anterior: SOF
Posterior: Petrous temporal bone
Medial: Body of sphenoid bone/sphenoid sinus
Lateral: Meningeal layer of dura mater
Roof: Meningeal layer of dura mater
Floor: Endosteal layer of dura mater

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16
Q

What structures run across the floor (within) of the cavernous sinus? (2)

What structures pass through the lateral wall of the cavernous sinus? (4)

A

CAT. 1. Internal carotid with sympathetic plexus
2. Abducents nerve (VI)

Lateral wall: OTOM
1. Oculomotor (III)
2. Trochlear (IV)
3. Ophthalmic (VI)
4. Maxillary (VII)

17
Q

How can an infection spread from extracranial to intracranial?

A

orbit/paranasal sinuses –> Facial vein –>anastaomsis with superior ophthalmic vein –> cavernous sinus.

18
Q

What is the route of the superior and inferior petrosal sinuses?

A

Start at posterior border of cavernous sinus.

passes along surface of temporal bone and empties into transverse sinus.