Dorello's channel: channel made of a tubular fold of the dura mater and positioned parasagittally on the clivus Blumenbachii. The channel contains the abducens nerve on its way to the cavernous sinus.

Meckel's cavity: epidural space on the medial aspect of medial cranial fosse (i.e., on the medial face of the basis of the greater wing of the sphenoid bone) that connects with the subarachnoid space of the middle cranial fossa. Meckel's cavity contains the Gasserian ganglion (trigeminal ganglion). The connection with the subarachnoid space allows the passage of the root of the trigeminal nerve. Anteriorly from the Gasserian ganglion, the ophthalmic and maxillary divisions of the trigeminal nerve lie between the dura and the wall of the venous sinus.

Cavernous sinus: venous sinus below a dural fold (green color in the image) immediately next to the corpus of the sphenoid bone. The space covered by the dura contains next to the venous cavernous sinus also the internal carotid artery in its intracerebral course between its emergence from the carotid canal and where it breaks through the dura, and it is traversed by cranial nerves III, IV, V1, V2 and vI. Of these nerves, the nVI has a close relationship with the internal carotid artery.

The illustration is a schematic coronal section through the corpus of the sphenoid bone. Note that nn V1, V2 and V3 join more posteriorly in the Gasserian ganglion which occupies an epidural space named Meckel's cavity.

Vidian channel: canal in the base of the pterygoid process, oriented horizontally and in the sagittal plane. The canal holds the greater petrosal nerve (preganglionic parasympathetic fibers belonging to facial nerve) on its way to the pterygopalatine fossa where the fibers synapse in the pterygopalatine ganglion onto postganglionic neurons whose destination is the lacrimal gland.

Hypoglosal canal: bony canal in the occipital bone at the base of the occipital condyle that holds the hypoglossl nerve on its way from the posterior cranial fossa to the parapharyngeal space. In the latter space, immediately after leaving the canal, the the hypoglossal nerve is joined by the ventral (motor) root of C1.


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