cranial ganglion trigeminal ganglion A ganglion on the sensory root of the fifth cranial nerve, situated in a cleft within the dura mater (trigeminal cave) on the anterior surface of the petrous portion of the temporal bone, and giving off the ophthalmic and maxillary and part of the mandibular nerve; it contains the cells of origin of most of the sensory fibers of the trigeminal nerve. BTO:0001231 BrendaTissueOBO Gasser's ganglion ganglion of trigeminal nerve ganglion trigeminale gasserian ganglion semilunar ganglion