136 Neurological Technique 



tatus, substantia corticalis cerebelli (vermis ?), brachium con- 

 junctivum, decussatio brachii conjunctivi, nucleus ruber, and 

 gyri (centrales) cerebri. 



(c) General motor (descending) pathways from cerebral 

 cortex to muscles, etc. 



1. Neurone systems involving nuclei of origin of the motor 

 nervi cerebrales: Gyri (centrales) cerebri (pyramidal cells), 

 corona radiata, capsula interna (pars occipitalis), basis pedunculi 

 to the nuclei of the oculomotorius, trochlearis, trigeminus 

 (portio minor), abducens, facialis, glossopharyngeus, vagus 

 (nucleus ambiguus), accessorius, and hypoglossus, and the roots 

 arising from these nuclei. 



2, Motor neurone systems involving the nervi spinales : Gyri 

 (centrales) cerebri (pyramidal cells), lobulus paracentralis, 

 corona radiata, capsula interna (pars occipitalis), basis pedunculi, 

 pyramides, decussatio pyramidum, fasciculi cerebro-spinales 

 (lateralis and anterior), columnae anteriores (ventral horns), and 

 radices anteriores (ventral roots). 



(^) Special conduction pathways. 



1. Olfactory: Regio olfactorii nasi, nervi olfactorii, bulbus 

 olfactorius, tractus olfactorius, trigonum olfactorium, and lobus 

 temporalis (uncus); area parolfactoria (Brocae), gyrus cinguli, 

 hippocampus, fornix, etc. For other connections see Rhinen- 

 cephalon. 



2. Visual : Retina, N. opticus, chiasma opticum, tractus opti- 

 cus, corpus geniculatum laterale, coUiculus superior, pulvinar, 

 capsula interna (pars occipitalis), radiatio occipito-thalamica, and 

 lobus occipitalis (cuneus, etc.). 



3. Auditory : Organon Corti, ganglion spirale, N. cochleae 

 (cochlea root of Vlllth), nucleus ventralis N. acusticae, nucleus 

 dorsalis cochleae, striae meduUares, nucleus olivaris superior, 

 corpus trapezoideum, lemniscus lateralis, coUiculi inferiores, 

 brachium quadrigeminum inferius, corpus geniculatum mediale, 

 capsula interna, corona radiata, and lobus temporalis (gyrus 

 temporalis superior). Determine the origin and central distribu- 

 tion of the N. vestibularis. 



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