I'l \< TIONS OP i III • i l:l r.l.l.l.i'M 





the trunk ;iik1 tail region are located in the remainder of the cerebellum. 

 These conclusions are the l>asis of the accompan} ing map of the cerebellum. 

 Basing his work on these anatomic conclusions, Van Rijnberk has studied 

 t he effed of circumscribed extirpation of certain Lobules of the cerebellum 

 on the muscular control of the differenl parts of the body, with the following 

 results. Total or partial extirpation of the lobulua simplex produces sid< 

 side oscillations of the head, indicating the removal <>t' the influei the 



cerebellum thai control the movements of the muscles of the neck. Complete 

 extirpation of the crus primum of the lobuli ansiformes causes ^ an imme- 

 diate irritative effecl dynamic disturbai the fore limb of the same 

 side, replaced later by a condition of atonia, which make* imb hang 

 limp, and of asthenia, which makes it feeble in its movement when i1 

 is excited to contract. Extirpation of the crus secundum lias a similar 



3 luina of th< 

 ■ in Rijnl i Luiciani. Op. lit.i On the riijlit I the 



differenl lobules to the functional develop! g to the 



theory of Bolk noted in the t< .ck.) 



influenc i the muscles of the hind limb of the corresponding > i < 1 > • . Extir- 

 pation of both crura of the lobulus ansiformis causes marked asthenia and 

 atonia in both fore and hind limb on the same side as the Lesion. A char- 

 acteristic disturbance in walking develops as a late effed of this extirpation. 

 It lias been termed the "hen's gait." Extirpation of the lobulus pai 

 medianus causes rotation on the longitudinal axis of the body, with pleuro- 

 thotonus tu the operated side. Fig 224 



•lust as in the case of cerebral localization, bo in ■ ar we find that 



within each of the largesl centers a more particular localization can <><■ mi 

 out; thus, in cadi of the centers for the upper and 1" 

 there is a definite arrangemenl of subsidiary cent< the dii of 



the activities of antagonistic muscle groups erned in the movem< 

 particular joints. It must be remembered, hi that in all I 



no real paralysis is produced bj extirpation, bu1 only a want irdina- 



