THE NERVOUS SYSTEM. 107 



The posterior column of the cord is represented in the medulla by the 

 posterior pyramid, or fasciculus gracilis, which is a continuation of the 

 posterior median column, and by the restiform body, comprising the 

 funiculus cuneatus and the funiculus of Rolando. The fasciculus gracilis 

 (Fig. 323, f'(/), diverges above as the broader clava to form, one on either 

 side, the lower lateral boundary of the fourth ventricle, then tapers off, 

 and becomes no longer traceable. The funiculus cuneatus, or the rest of 

 the posterior column of the cord, is continued up in the medulla as such 

 (Fig. 323, f.c); but soon, in addition, between this and the continuation 

 of the posterior nerve roots, appears another tract called the funiculus of 

 Rolando (Fig. 323, f. R). High up, the funiculus cuneatus is covered 



FIG. 323. Posterior view of the medulla, fourth ventricle, and mesencephalon (natural size). 

 p. n, line of the posterior roots of the spinal nerves; p.m./., posterior median fissure; f.y., funiculus 

 gracilis; cl., its clavis; f.c., funiculus cuneatus; /.J?., funiculus of Rolando; r.b., restiform body; 

 c.s., calamus scriptorius; I., section of ligula or ttenia: part of choroid plexus is seen beneath it; Z.r., 

 lateral recess of the ventricle; str., strige acusticse; t./., inferior fossa; s.f., posterior fossa; between 

 it and the median sulcus is the fasciculus teres; cbl., cut surface of the cerebellar hemisphere; n.d., 

 central or grey matter; s.m.v., superior medullary velum; Ing., ligula; s.c.p., superior cerebellar 

 pedunclecut longitudinally; cr., combined section of the three cerebellar peduncles; c.g.s., e.g.*., cor- 

 pora quadrigemina (superior and inferior); /r., fraenulum; /., fibres of the fillet seen on the surface 

 of the tegmentum; c., crusti; l.g., lateral groove; c.r/.i., corpus geniculum internus; th., posterior 

 part of thalamus; p., pineal body. The roman numbers indicate the corresponding cranial nerves. 

 (E. A. Schafer.) 



by a set of fibres (arcuate fibres), which issue from the anterior median 

 fissure, turn upward over the anterior pyramids to pass directly into the 

 corresponding hemisphere of the cerebellum, being joined by the fibres of 

 the direct cerebellar tract; the funiculus of Rolando, and the funiculus 

 cuneatus, although appearing to join them, do not actually do so, except 

 to a partial extent. 



Grey matter of the medulla. To a considerable extent the, grey matter 



