. The brain as an organ of mind. the Cerebellum thefibres of these Peduncles are said not to come into relationwith the central bag-like grey nuclei, but to pass at onceto different regions of the cortical grey matter. The inner portion of each Lower Peduncle appears to CiiAP. XXIIL OF THE HUMAN BRAIN. 463 be made up by the centripetal prolongations of the Audi-tory Nerve; the fibres of which are traceable from its own external nucleus to the nucleus du toit of Stilling onthe same and on the opposite side. But the outer portionof the Pedun-cle, Meynertsays, is de-rived from theopposite pos-ter
. The brain as an organ of mind. the Cerebellum thefibres of these Peduncles are said not to come into relationwith the central bag-like grey nuclei, but to pass at onceto different regions of the cortical grey matter. The inner portion of each Lower Peduncle appears to CiiAP. XXIIL OF THE HUMAN BRAIN. 463 be made up by the centripetal prolongations of the Audi-tory Nerve; the fibres of which are traceable from its own external nucleus to the nucleus du toit of Stilling onthe same and on the opposite side. But the outer portionof the Pedun-cle, Meynertsays, is de-rived from theopposite pos-terior columnof the Cord inthe followingmanner. Thefibres of theposterior me-dian column( funiculuscuneatus etgracilis ) en-ter or comeinto relationwith the gang-lion cells ofthe corres-ponding oli-vary body ;thence theycross the me-dian line ofthe Medulla,behind the * anterior pyramids, to pass round the opposite olivarybody before emerging in the form of arcuate fibres atthe posterior and lateral region of the Medulla. Here they. Fig. 166.—The Middle Cerebellar Peduncles and Pons,with Contiguous Parts. (Sappey, after Hirschfeld.) 1,Optic Commissure ; 2, Tube r Cinereum and Pituitary ped-icle ; 3, Corpora mammillaria; 4, Inter-peduncular space ;5, Cerebral peduncle ; 6, 6, Median groove on Pons, with (7)a slight prominence on each side; 8, origin of the trige-minus ; 9, superior transverse fibres of the Pons ; 10, 10, Itsmedian fibres ; 11, its lower fibres dipping beneath the ; 12, 12, middle Cerebellar peduncles, formed by the)inion of these three sets of fibres ; the left ptduncle isdivided near its origin, the right is in part dissected , Spinal Cord; 14, median furrow of the Medulla; 15, 15,decussation of the pyramids (16); 17, Olivary body; 18, Arci-form fibres. 464 THE INTERNAL STRUCTURE throw themselves into, and ascend as part of, the LowerPeduncle. Thus, the fibres of each posterior column sink beneath the surface of the Spinal Cord, and afterpassing thr
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