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Questions and Answers
What is the lining of dural sinuses?
Where is the occipital sinus located?
What is the final destination of the blood from the inferior sagittal sinus, occipital sinus, and superior sagittal sinus?
What is the major contributor to the cavernous sinus?
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Where does the superior petrosal sinus empty into?
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What is the final destination of the blood from the sigmoid sinus?
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What receives blood from the facial vein?
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What vein is formed by the fusion of the subclavian vein and the internal jugular vein?
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Where does the superior vena cava empty into?
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What type of blood is carried by the superior vena cava?
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Study Notes
Dural Sinuses
- Dural sinuses are veins found within the space between the periosteum and meningeal layer of the dura mater
- They are lined with endothelial cells
- Examples of dural sinuses:
- Inferior sagittal sinus: located in the lower part of the falx cerebri
- Occipital sinus: located within the skull, above the occipital bone
- Superior sagittal sinus: located in the upper part of the falx cerebri
Venous Drainage of the Head and Neck
- The inferior sagittal sinus, occipital sinus, and superior sagittal sinus all empty into the straight sinus
- The straight sinus empties into the transverse sinus
- The transverse sinus empties into the sigmoid sinus
- The sigmoid sinus empties into the internal jugular vein
Cavernous Sinus
- The cavernous sinus receives blood from:
- Ophthalmic vein: drains the orbit
- Facial vein: drains the nose and lips
- Sphenoid parietal sinus: a major contributor to the cavernous sinus
- The cavernous sinus drains into:
- Superior petrosal sinus: empties into the sigmoid sinus
- Inferior petrosal sinus: empties into the internal jugular vein
Internal Jugular Vein
- The internal jugular vein receives blood from:
- Sigmoid sinus
- Inferior petrosal sinus
- Facial vein
- Superficial temporal vein
- Superior thyroid vein
- Middle thyroid vein
- The internal jugular vein empties into the subclavian vein
Brachiocephalic Vein
- The brachiocephalic vein is formed by the fusion of the subclavian vein and the internal jugular vein
- There are two brachiocephalic veins: right and left
- The right and left brachiocephalic veins fuse to form the superior vena cava
Superior Vena Cava
- The superior vena cava is formed by the fusion of the right and left brachiocephalic veins
- The superior vena cava empties into the right atrium
- The superior vena cava carries deoxygenated blood from the head and neck to the heart
Dural Sinuses
- Located between the periosteum and meningeal layer of the dura mater
- Lined with endothelial cells
- Examples:
- Inferior sagittal sinus: in lower part of falx cerebri
- Occipital sinus: in skull, above occipital bone
- Superior sagittal sinus: in upper part of falx cerebri
Venous Drainage of the Head and Neck
- Inferior sagittal sinus, occipital sinus, and superior sagittal sinus drain into straight sinus
- Straight sinus drains into transverse sinus
- Transverse sinus drains into sigmoid sinus
- Sigmoid sinus drains into internal jugular vein
Cavernous Sinus
- Receives blood from:
- Ophthalmic vein: drains orbit
- Facial vein: drains nose and lips
- Sphenoid parietal sinus: major contributor
- Drains into:
- Superior petrosal sinus: empties into sigmoid sinus
- Inferior petrosal sinus: empties into internal jugular vein
Internal Jugular Vein
- Receives blood from:
- Sigmoid sinus
- Inferior petrosal sinus
- Facial vein
- Superficial temporal vein
- Superior thyroid vein
- Middle thyroid vein
- Empties into subclavian vein
Brachiocephalic Vein
- Formed by fusion of subclavian vein and internal jugular vein
- Two brachiocephalic veins: right and left
- Right and left brachiocephalic veins fuse to form superior vena cava
Superior Vena Cava
- Formed by fusion of right and left brachiocephalic veins
- Empties into right atrium
- Carries deoxygenated blood from head and neck to heart
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Description
This quiz covers the anatomy of dural sinuses, including their location and function, as well as the venous drainage of the head and neck.
