Diseases of the nervous system .. . FiG. 13.—Diagram of the Cerebral,Peduncles. (After Obersteiner.) Qa, Anterior corpora quadrigemina; AS, aqueduct of Sylvius; FU:, pos-terior longitudinal bundle; Tg, teg-mentum; Nt, red nucleus; SnS, sub-stantia nigra Soemmeringi; 1, frontalpontal tract; 2, tract of the motor. cranial nerves; S, pyramidal tract;Ij., tract of muscle sense; 5, sensoryportion of the fibers of the cerebralpeduncle; 6, bundle from the lem-niscus to the foot; 7, stratum inter-mediimi. MACROSCOPIC ANATOMY OF THE CENTRAL NERVOUS SYSTEM 21 rior eminence in man is exceeclingiy small c
Diseases of the nervous system .. . FiG. 13.—Diagram of the Cerebral,Peduncles. (After Obersteiner.) Qa, Anterior corpora quadrigemina; AS, aqueduct of Sylvius; FU:, pos-terior longitudinal bundle; Tg, teg-mentum; Nt, red nucleus; SnS, sub-stantia nigra Soemmeringi; 1, frontalpontal tract; 2, tract of the motor. cranial nerves; S, pyramidal tract;Ij., tract of muscle sense; 5, sensoryportion of the fibers of the cerebralpeduncle; 6, bundle from the lem-niscus to the foot; 7, stratum inter-mediimi. MACROSCOPIC ANATOMY OF THE CENTRAL NERVOUS SYSTEM 21 rior eminence in man is exceeclingiy small compared witli tliat of the loweranimals^ for its function as the center of the optic nerve is almost entirelymerged in that of the occipital lobe and the thalamns opticus. Immediatelybelow its center is the narrow posterior continuation of the third ventricle, theaqueduct of Sylvius; at either side extending downward is the region of the. Fig. 14.—The Cerebellum from the Dorsal Side. (After Edinger.) tegmentum which, as Ave have just seen, is separated from the foot of thecerebral peduncles by the substantia nigra. The posterior eminences appearmacroscopicallv to be more sharpl}- defined than the anterior. In all trans-verse sections of the corpora quadrigemina the red nucleus may be recognizedas a round red structure, lying dorsally from the aqueduct of Sylvius andnear the median line; in this structure generally terminates the hrachiumconjunctivum which comes from the cerebellum and has just crossed it. Be-tween the two red nuclei are the nuclei and fiber bundles of the third cranialnerve, the oculomotor, the exit of which at the base of the brain will be laterdescribed, and behind it are the nuclei of the trochlear nerve. The aqueduct of Sylvius after dilating becomes posteriorly the fourth ven-tricle, the rhomboid fossa, the roof of which is formed by the cerebellum, thefloor and sides by the continuation of the
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