320 



BRAIN MECHANISMS AND LEARNING 



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Fig. II 



A.\t)-dcndritic cross contacts in ccrebcUuiu (III). Low magnification electron- 

 micrograph of rat cerebellum (molecular layer) showing the relationship of a 

 Purkinjc dendrite — p d — with crossing fibres f These are more or less of equal 

 diameter and are supposed to be parallel fibres. Palay interprets them as derivating 

 from Fananas' cells (Palay, 1958). The clear spaces may correspond to glial fibres 

 — s. At Mc a micro-club or dendrite thorn can be depicted — M — Mitochondria, 

 d.f. dendrite filaments < 22.000. (See also Figs, y and 10.) 



