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ganglion semilunare (Gasseri)
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Nerves of the orbit Seen from above (Semilunar ganglion visible near bottom)
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Distribution of the maxillary and mandibular nerves, and the Submaxillary Ganglion (Semilunar ganglion visible in upper left)
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Semilunar+Ganglion
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The (or '''Gasserian ganglion''', or '''trigeminal ganglion''') occupies a cavity (cavum Meckelii) in the
Dura Mater covering the
Trigeminal impression near the apex of the
Petrous Part of the
Temporal Bone .
It is somewhat crescentic in shape, with its convexity directed forward: medially, it is in relation with the
Internal Carotid Artery and the posterior part of the
Cavernous Sinus .
The
Motor Root runs in front of and medial to the
Sensory Root , and passes beneath the
Ganglion ; it leaves the skull through the
Foramen Ovale , and, immediately below this foramen, joins the
Mandibular Nerve .
The
Greater Superficial Petrosal Nerve lies also underneath the ganglion.
The ganglion receives, on its medial side, filaments from the
Carotid Plexus of the sympathetic.
It give off minute branches to the
Tentorium Cerebelli , and to the dura mater in the middle fossa of the cranium.
From its convex border, which is directed forward and lateralward, three large nerves proceed, viz., the
Ophthalmic ,
Maxillary , and
Mandibular .
The ophthalmic and maxillary consist exclusively of sensory fibers; the mandibular is joined outside the cranium by the motor root.
