ASPECTS OF INHIBITORY PATHWAYS AND SYNAPSbS 



39 





Lf ft superior rccfu: 



\- 



Left rnediat rectus 



Left mfericr recti 



Fig. 9. Inhibition of vestibiiio-ocuiar three-neuron reflexes by electiic stimula- 

 tion of the Darkschewitsch nucleus region. Isolated contractions, among all 

 ocular muscles, in the ipsilateral superior obliquus and contralateral inferior 

 rectus evoked by artificial "from ampulla" endolymph currents in the right 

 posterior semicircular duct (Sign. II, downstroke) are promptly inhibited by 

 electric stimulation of the Darkschewitsch nucleus (Sign. 1, upwards). After 

 Szentagothai and Schab (1956). 



4. CLARKE'S COLUMN 



Three different types of synapses could be differentiated histologically 

 (Szentagothai and Albert, 1955) in Clarke's column, as explained diagram- 

 matically in Fig. 10, the main histological evidence being demonstrated on 



