. Diseases of the nervous system : for the general practitioner and student. ves are in connection with the mid-brain,viz. third, fourth and fifth nerves. The nuclei of the third and fourthform a continuous column of nerve-cells situated in the gray mattersurrounding the aqueduct of Sylvius. A section through the posterior THE CENTRAL NERVOUS SYSTEM 23 quadrigeminal bodies shows the origin of the fourth nerves and throughthe anterior bodies the origin of the third nerves (Fig. 19). The nucleus of the third nerve is connected with the optic tract bymeans of neurones originating in the anterior
. Diseases of the nervous system : for the general practitioner and student. ves are in connection with the mid-brain,viz. third, fourth and fifth nerves. The nuclei of the third and fourthform a continuous column of nerve-cells situated in the gray mattersurrounding the aqueduct of Sylvius. A section through the posterior THE CENTRAL NERVOUS SYSTEM 23 quadrigeminal bodies shows the origin of the fourth nerves and throughthe anterior bodies the origin of the third nerves (Fig. 19). The nucleus of the third nerve is connected with the optic tract bymeans of neurones originating in the anterior quadrigeminal bodies,with the fourth, sixth and seventh nerves through the posterior longi-tudinal bundle (see Medulla) and with the eighth nerve through the samebundle and lemniscus. usiurlz,/tos(e NUCLEUS OF POSTE-RIOR COMMISSUREAND MED. LONG MEDIAL LONGITUDI-NAL FASCICULUS MM. CILIARIS (a) AND SPHINCTER IRIDIS (b) LEVATOR v- PALPEBRM \ 3OBLIQUUS INFERIOR —~.v-^ RECTUS SUPERIOR -••-*£<_ :4 RECTUS MEDIA LIS — » RECTUS INFERIOR - (I (JTuA. _-— SUPERIOR GROUP(Nucleus of Edingerand Westphal) -INFERIOR GROUP Fig. 19.—Diagram of Longitudinal Section of Nucleus of Oculomotor Nerve. {Morris Anatomy, after Edinger.) As to the nucleus of the fifth (trigeminus) nerve, its motor portionwith the descending motor fibers is found in the mid-brain. The RedNuclei are two round pigmented masses of gray matter, situated in thetegmentum under the anterior quadrigeminal bodies. They receivefibers from the cerebral cortex and corpus striatum, also send out fibersto the thalamus and spinal cord (Fig. 20). 24 THE CENTRAL NERVOUS SYSTEM AREA OF OPTIC THALAMI, THIRD INTERBRAIN The Optic Thalami are two voluminous ovoid masses of gray sub-stance situated in front of and laterally to the quadrigeminal bodies (seepreceding chapter) and on both sides of the third ventricle. Close toeach other in front they diverge posteriorly. THALAMUS \- - INT
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectnervous, bookyear1913
