368 LABORATORY MANUAL OF HUMAN ANATOMY 



(b) Medial nucleus (nucleus N. vestibularis medialis). 



(c) Superior nucleus (nucleus N. vestibularis superior). 



(d) Nucleus of descending root (nucleus radicis descendentis) . 

 Secondary paths : 



(a) From lateral nucleus of Deiters to lateral funiculus of cord. 



(b) From medial and superior nuclei to fasciculi longitudinales me- 



diales of 'two sides for eye-muscle nuclei, etc. 



(c) From lateral and superior nuclei to nucleus fastigii, nucleus den- 



tatus, and cortex vermis. 



(d) From all the terminal nuclei, through the substantia reticularis 



alba to the [ventro-] lateral nuclei of the thalamus (?). 

 Tertiary path: from [ventro-] lateral nuclei of thalamus to central gyri 



(somaesthetic area). 

 (B) Cochlear nerve (N. cochlearis). 



Nucleus originis : spiral ganglion (ganglion spirals). 

 Nuclei terminates : 



(a) Ventral nucleus (nucleus N. cochlearis ventralis). 



(b) Dorsal nucleus (nucleus N. cochlearis dorsalis [nucleus tuberculi 



acustici] ) . 

 Secondary paths: 



(a) Fibres from ventral nucleus through corpus trapezoideum to 



upper olives, and through lateral lemniscus to nucleus of lat- 

 eral lemniscus, inferior colliculus, middle gray layer of supe- 

 rior colliculus, and through brachium quadrigeminum inferius 

 to medial geniculate body, possibly some even to temporal 

 cortex. 



(b) Fibres from dorsal nucleus through stria medullares to trapezoid 



body. 



Tertiary paths: from end-stations of secondary path (a), especially 

 from nucleus colliculi inferioris and nucleus corporis geniculati me- 

 dialis, through capsula interna and pars temporalis of corona radiata, 

 to gyrus temporalis superior (junction of third and fourth fifths) 

 and adjacent gyri temporales transversi. [When this cortical area is 

 diseased, the patient has " word-deafness."] 



GLOSSOPHARYNGEAL AND VAGAL NERVES (N. GLOSSOPHARYNGEUS ET N. VAGUS). 



(A) Motor part. 



Nuclei originis: 



(a) Dorsal nucleus (nucleus dorsalis Nn. glossopharyngei et vagi) in 



medulla oblongata just medial from ala cinerea. 



(b) Ventral nucleus (nucleus ambiguus) in the formatio reticularis 



of medulla oblongata just dorsal from nucleus olivaris accesso- 

 rius dorsalis. 

 Cortical control: 



(a) Pyramidal tract from central gyri. 



(b) Accessory lemniscus (?). 



(B) Sensory part. 



Nuclei originis: 



(a) For N. glossopharyngeus. 



(aa) Superior ganglion (ganglion superius). 



(ab) Petrosal ganglion (ganglion petrosum). 



(b) For N. vagus. 



