870 



HANDBOOK OF PHYSIOLOGY 



NEUROPHYSIOLOGY 11 



Normal extrapyrami 



(afferent and efferent) 



^^— "pyramidal system 



systems of the putamen 



systems of the caudate 

 and ruber 



systems of the vestibular and 

 inter sTitial nucleus 

 systems of the reticular 

 formation 



■systems of the nigra 



FIG. 4. Fiber connections of the extrapyramidal motor system 

 with the afferent and efferent pathways. 



Slria'al systems. Afferent connections to the striatum arise 

 from the emboliform nucleus (Eb) of the cerebellum, pass 

 through centrum medianum (Cc) and reach both the caudatum 



{Cd) and the putamen (Put). The caudatum has two efferent 

 pathways, a) to the nucleus niger anterior part (AV) where it 

 converges with efferent tracts from the prefrontal cortex (areas 

 q to 12) and b) through dorsal parts of the pallidum externum 

 (Pall.e) and internum (Pnll.i) to the most rostral nucleus of 



