. A treatise on nervous and mental diseases, for students and practitioners of medicine. Brcj. Superior cerebellar peduncle. Aq. Aqueductof Sylvius. Sqs. Sulcus beneath the quadrigeminal bodies. lemuisco-pedal tract—and at IV are seen the fibres of the trochlearnerve crossino- in the roof of the fourth ventricle. ANATOMY. 51 Fig. 33 represents a section made through the posterior portion ofthe anterior qiiadrigeminal bodies. The same structures can be studiedin this as in Fig. 32, which ^ve have just considered, except that thedescending fibres of the trochlear nerve are distinctly represented
. A treatise on nervous and mental diseases, for students and practitioners of medicine. Brcj. Superior cerebellar peduncle. Aq. Aqueductof Sylvius. Sqs. Sulcus beneath the quadrigeminal bodies. lemuisco-pedal tract—and at IV are seen the fibres of the trochlearnerve crossino- in the roof of the fourth ventricle. ANATOMY. 51 Fig. 33 represents a section made through the posterior portion ofthe anterior qiiadrigeminal bodies. The same structures can be studiedin this as in Fig. 32, which ^ve have just considered, except that thedescending fibres of the trochlear nerve are distinctly represented atthe side of the aqueduct at I V\ whilst at Sqs, above the aqueduct ofSylvius, is seen the sulcus between the anterior quadrigeminal bodies,the so-called sulcus corpormn quadrigeminorum sagittalis, and at Nlmlis the nucleus of the lateral lemniscus. Fig. 34 is a section through the region of the pineal gland, as rep-resented in Pig. 27. Here we see that the motor and the sensory fil)resthat have come down in the crura cerebri are widely separated, the Fig. 34. r ! ^^ ^.^~ ..yd. M. F-4\ Pp. Pes or foot of the crura cerebri. iSns. Substantia nigra. Csth. Sub-thalamicbody or body of Luys. Atg. Eed nucleus. Al. Ansa lenticularls. F. Forels teg-mental decussation. M. Meynerts ventral decussation. N^. Nucleus of oculo-inotornerve. Flp. Posterior longitudinal fasciculus. Aq. Aqueduct of Sylvius. BSP. Sub-pineal recess. Co;?. Posterior commissure. Fii. Descending root of fifth. Q4. Anteriorquadrigeminal body. Lm. Lateral lemniscus. motor fibres lying in the so-called foot or pes of the crura cerebri atPp, and the sensory fibres lying above in tiic lemniscus atLm, the ])0s-terior longitudinal fasciculus at jP/p, and at Al a set of fibres, prob-ably sensory, that pass around the lenticular nucleus into the internalcapsule, and which arc therefore known as the ansa lenticularls {Linscn- 52 INTRODUCTORY. keryischlinge). At N^ is seen a portion of the nucleus of the third ormotor oculi
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