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Cavernous sinus
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Everything about The Cavernous Sinus totally explainedThe cavernous sinus (or lateral sellar compartment), within the human head, is a large collection of thin-walled veins creating a cavity bordered by the sphenoid bone, lateral to the sella turcia, and the temporal bone of the skull.
Contents
The sinus may be joined by several anastomoses across the midline. The cavernous sinus receives the ophthalmic vein through the superior orbital fissure and is connected to the basilar plexus of veins posteriorly. The internal carotid artery, and cranial nerve III, IV, V, and VI all pass through this blood filled space. Infection from the face may reach the cavernous sinus through its many anastomotic connections, with severe consequences. The cavernous sinus drains by two channels, the superior and inferior petrosal sinuses.
Each cavernous sinus (one for each hemisphere of the brain) contains the following:
- vertically, from superior to inferior
horizontally
One mnemonic for remembering the contents is "OTOM CAT"
Venous connections
It receives tributaries from:
Superior and inferior ophthalmic veins
Sphenoparietal sinus
Superficial middle cerebral veins
The veins of exit are to the superior and inferior petrosal sinuses as well as via the emissary veins through the foramina of the skull (mostly through foramen ovale).
There are also connections with the pterygoid plexus of veins via inferior ophthalmic vein, deep facial vein and emissary veins.
Clinical significance
It is the only anatomic location in the body in which an artery travels completely through a venous structure. If the internal carotid artery ruptures within the cavernous sinus, an arteriovenous fistula is created (more specifically, a carotid-cavernous fistula).
The pituitary gland lies between the two paired cavernous sinuses. An abnormally growing pituitary adenoma, sitting on the bony sella turcica, will expand in the direction of least resistance and eventually compress the cavernous sinus. Cavernous sinus syndrome may result from mass effect of these tumors and cause ophthalmoplegia (from compression of the oculomotor nerve, trochlear nerve, and abducens nerve), ophthalmic sensory loss (from compression of the ophthalmic nerve), and maxillary sensory loss (from compression of the maxillary nerve).
Additional images
Image:Gray571.png|Oblique section through the cavernous sinus.
Image:Gray572.png|Veins of orbit.
Image:Ciliary ganglion pathways.png|Pathways in the Ciliary Ganglion.
Image:Human brain dura mater (reflections) description.JPG|Human brain dura mater (reflections)
Further Information
Get more info on 'Cavernous Sinus'.
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