. A treatise on nervous and mental diseases, for students and practitioners of medicine. gula, thelobe of the cerebellum lying over the valve of Vieussens, Avhich can ANATOMY. 49 also be seen in this illustration. Brcj is the superior cerebellarpeduncle, and Crst is the restiform body, forming the inferiorcerebellar peduncle. Fig. 31 is a microscopical section made higher up, so that it comesjust behind the posterior quadrigeminal bodies, as represented inFig. 27. In it the motor fibres running to the periphery are seen inthe pyramids, Py, and running between these from side to side arethe tra
. A treatise on nervous and mental diseases, for students and practitioners of medicine. gula, thelobe of the cerebellum lying over the valve of Vieussens, Avhich can ANATOMY. 49 also be seen in this illustration. Brcj is the superior cerebellarpeduncle, and Crst is the restiform body, forming the inferiorcerebellar peduncle. Fig. 31 is a microscopical section made higher up, so that it comesjust behind the posterior quadrigeminal bodies, as represented inFig. 27. In it the motor fibres running to the periphery are seen inthe pyramids, Py, and running between these from side to side arethe transverse fibres of the pons, Po. Above these, or dorsad, is thelemniscus, Lm, and the lateral lemniscus, Lml, whilst at Frtg is thecentral field of the tegmentum. The superior cerebellar peduncle isseen laterally to the tegmental field at Brcj. Just above the teg-mental field is seen the section transversely of the posterior longi-tudinal fasciculus, Flp. The aqueduct of Sylvius is very clearlyshown at Aq, and above it is the lower portion of the lingula. Fig. 32. JV2 Xy Irri )^^^ LmP. Drawing ot section made just behind the posterior quadrigeminal Pyramid. Fo. Transverse fibres ol pons. Lm. Lemniscus. Lml. Lateral lem-niscus. LmP. Tract connecting lemniscus and pes, lemnisco-pedal tract. Frtg. Centralfield of tegmentum. Flp. Posterior longitudinal fasciculus. Leo. Locus Descending root of fifth pair. Aq. Aqueduct of Sylvius. IV^. Decussation ottrochlear nerve fibres. Brcj. Superior cerebellar peduncle. JVFm. Motor nucleus offifth pair. 4 50 INTRODUCTORY. In Fig. 32 is represented a section also made at the posterior portionof the quadrigeminal bodies, and in it is shown the relation of thevarions parts which we have been considering : the pyramids at Py,the transverse iibres of the pons at Po, the sensory fibres of the lem-niscns and the lateral lemniscus at Lm and Lml, the central field ofthe tegmentum, Frtg, the posterior longi
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