Quain's elements of anatomy . diateinto the upper parts of the medullary centre of the hemis|)heres, andinto the upper part of the worm. Those which pass into the wormcurve over the corpus dentatum, and are termed by Stilling the semi-circular fibres. A small part of the fibres of the restiform body issaid by Stilling to enter the corpus dentatum. The superior pedunclepasses almost entirely into the interior of the dentate nucleus, but somefibres curve round the outer side of this without passing into it, whilesome of the mesial fibres are traceable directly into the white substanceof the worm
Quain's elements of anatomy . diateinto the upper parts of the medullary centre of the hemis|)heres, andinto the upper part of the worm. Those which pass into the wormcurve over the corpus dentatum, and are termed by Stilling the semi-circular fibres. A small part of the fibres of the restiform body issaid by Stilling to enter the corpus dentatum. The superior pedunclepasses almost entirely into the interior of the dentate nucleus, but somefibres curve round the outer side of this without passing into it, whilesome of the mesial fibres are traceable directly into the white substanceof the worm. Probably many of the fibres of these peduncles whichenter the dentate nucleus are connected with its cells, but others pass 314 MESENCEPHALON. in bundles through the grey lamina which composes it, without beingthus connected. Their further course is not known, for they becomelost in a feltwork of large fibres which encapsules the nucleus, but theyprobably go eventually to the superficial grey matter of the lamiuEe. Vm. Fig. 285.—YiEw OF A dissection op THE FIBRES OF THE PONS AAROLII AND CEREBELLUM (froni Arnold). 5 h, the pyramid ; h, its fibrestraced upwards through the ponsVarolii; c, lateral column ; d, olive;m, superficial transverse fibres of thepons on its left side ; m, the deepertransverse fibres of the right side;m!, the prolongation cf the ti\ansversefibres of the pons as the middlel^eduncle of the cerebellum ; ^3, q,their continuation into the laminaeand folia of the cerebellum ; n,inferior peduncle ; x, the decussatingpart of the left lateral column cross-ing to the right pyramid. From the anterior medullary velum longitudinal fibres can be tracedpassing into the white centre of the v,orm, and blendiug with the semi-circular fibres above mentioned. Commissural fibres in the white matter of the cerelellum.—Two chiefsets of decussating com^nissural fibres are described by Stilling in themiddle line of the cerebellum ; one at the anterior part of the worm a
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