CONDUCTION PATHS 



897 



2. Nuclei of origin of motor cranial nerves and motor components of mixed cranial 

 nerves, of opposite side chiefly and thence by way of these nerves to the respective 

 muscles supplied. 

 Notes: (1) Most of the descending cortical fibres to the nucleus of origin of the trochlear 



Fig. 706. — Scheme op Descending Cerebro-spinal Conduction Pathways. 



Somaesthetic area 

 of cerebral cortex 



Caudate nucleus' 



Internal capsule 



L e nti cular, 



nucleus I 1>^ 



Cerebral 

 peduncle 

 Trochlear nerve 



Medulla oblongata 



Lateral cerebro-spinal 

 fasciculus 



.Ventral cerebro-spinal 

 fasciculus 



Ventral roots of 

 spinal nerves 



Ventral white 

 commissure 



Spinal cord 



nerve and that portion of the nucleus of the oculomotor which supplies the internal rectus 

 muscle apparently do not decussate but terminate in the nuclei of the same side. 



(2) The efferent nucleus of the glosso-palatine (salivatory nucleus) and the dorsal efferent 

 nucleus of the vagus give rise to visceral efferent fibres, i. e., carry impulses destined for smooth 

 muscle and glands by way of sympathetic neurones. The same is true for the supero-median 

 part of the nucleus of the oculomotor. 

 57 



