. Kirkes' handbook of physiology . corpusquadrigeminum, giving rise to a bundle of long fibers termed the descendingroot. It is also connected with the locus ceruleus. The sensory nucleusreceives a tract of sensory fibers from the trigeminus extending as low as thesecond cervical nerve, and this forms a tract at the tip of the posterior cornu,between it and the restiform body. The cells of origin of the sensory tract 552 THE NERVOUS SYSTEM are in the Gasserian ganglion. The nerve appears at the ventral surface ofthe pons near its front edge, at some distance from the mid-line. Motor Functions.
. Kirkes' handbook of physiology . corpusquadrigeminum, giving rise to a bundle of long fibers termed the descendingroot. It is also connected with the locus ceruleus. The sensory nucleusreceives a tract of sensory fibers from the trigeminus extending as low as thesecond cervical nerve, and this forms a tract at the tip of the posterior cornu,between it and the restiform body. The cells of origin of the sensory tract 552 THE NERVOUS SYSTEM are in the Gasserian ganglion. The nerve appears at the ventral surface ofthe pons near its front edge, at some distance from the mid-line. Motor Functions. The first and second divisions of the nerve, which arisewholly from the larger root, are purely sensory. The third division is joinedby the motor root of the nerve and is of course both motor and sensory. Motor branches of the lesser or non-ganglionic portion of the fifth supplythe muscles of mastication, namely, the temporal, masseter, two pterygoid,anterior part of the digastric, and mylohyoid. FiLments are also said to supply. Fig. 386.—General Plan of the Branches of the Fifth. X |. I, Lesser root of the fifth; 2, greaterroot passing forward into the Gasserian ganglion; 3, placed on the bone above the ophthalmic nerve,which is seen dividing into the supra-orbital, lachrymal, and nasal branches, the latter connectedwith the ophthalmic ganglion; 4, placed on the bone close to the foramen rotundum, marks thesuperior maxillary division, which is connected below with the spheno-palatine ganglion, andpasses forward to the infra-orbital foramen; 5, placed on the bone over the foramen ovale, marksthe inferior maxillary nerve, giving off the anterior auricular and muscular branches, and continuedby the inferior dental to the lower jaw, and by the gustatory to the tongue; a, the submaxillarygland, the submaxillary ganglion placed above it. in connection with the gustatory nerve; 6, thechorda tympani; 7, the facial nerve issuing from the stylomastoid foramen. (Charles Bell.) the te
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