,sr.W U.1AT ()] CO\J)('CT10.\ 1'ATJIS 871 



III. CKKKHKU, PATH Knit -MIK CUKNI- i.fsivK OK 'J'tiosE OF Srni'i.si. S> \-i: 



A. ASI-I i. -nes. 



1. (ianglia "' origin oi sensory components of vagus, glo <;eus, pars intermedia 



of facial, and t rigcminus. 



I'eripheral arborisations ai ' jM'ripheral branches of T-fibres of same. 



(lit Central branches of T-fibres <>t same. 



2. Nuclei of tenniuation of central branches (bifurcated anil unbifurcated) in medulla 



obtonyata. 



(a) Retieular formation and medial leumisriis of .same and (chiefly) the opposite 

 side. 



3. Hypothalamic nucleus and lateral nucleus of tlialaiuus. 



((i) Internal capsule, anterior part of occipital portion. 



ororia radiata. fronto-parietal part. 

 (c) Soma-sthetic area of cortex cerebri. 



B. DI.-H'I niliii-i si/nlrm of neurones. 



1. Pyramidal cells of soma'sthetie area. 



(a) Corona radiata. fronto-parietal. 



(6) Internal capsule, genu chiefly. 



I- Basil of cereliral peduncle and peduncle. 



(rf) Accessory lemniscus of von Bechterew. 



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



nerves, and thence by way of these nerves to the respective muscles supplied. 



IV. THE SHORT ' REFLEX ' PATHS OF THE CRANIAL NERVES 



These consist of the cent ral branches of their afferent or sensory fibres, terminating in the nuclei 

 of origin of both their own motor components and in the nuclei of origin of other motor nerves, 

 l-'ilires to the more distant nuclei pass to them by way of the medial longitudinal fasciculus. 

 Instead of terminating in the motor nuclei directly, the sensory fibres are frequently interrupted 

 by a third or intermediate neurone interposed in the chain. The vagus and glosso-pharyngeus 

 are connected by way of the solitary fasciculus and its nucleus with the structures below their 

 level of entrance, probably even with the ventral horn cells of the upper segments of the cervical 

 cord, and through these with the muscles of respiration. 



V. CONDUCTION PATHS INVOLVING THE CEREBELLUM 



A. Ascending cerebeUar pathways. 



1. Spinal ganglia. 



(a) Dorsal roots of spinal nerves. 



(6) Collaterals and descending branches of bifurcation of dorsal root fibres in 



spinal cord. 

 2x. Dorsal nucleus (Clarke's column). 



(a) Cerebello-spinal fasciculus (direct cerebellar tract). 



(6) Restiform body (inferior oereliellar peduncle) 



(c) Joined in medulla by external arcuate fibres (crossed and uncrossed fibres 



arising in nuclei of funieulus gracilis and cuneatusi; 



(d) Joined in medulla by fibres arising in nuclei of termination of afferent vagus, 



glosso-pharynireal. vcstibular, and trigeminal ner\ 



(e) Joined by fibres both to and from (ascending and descending) the inferior 



olivary nucleus of 1 1 id opposite , hello-olirnry fibres). 



2y. Nerve-cells in base of ventral horn of same and opposite side. 



(a) Antero-lateral cerebello-spinal fasciculus ((lowers' tract), ascending through 



spinal cord and reticular formation of medulla and pons. 

 (6) Anterior medullary velum and braohium conjunctivum to cerebellar cortex 



(vermis) (fig. 606). 



3. Cerebellar cortex (vermis), dentate nucleus, nucleus fastigii, nucleus emboliformis, 



and nucleus globosus. 

 (a) White substance (corpus medullare) of cerebellum, associating various regions 



of its cortex and its nuclei with each other. 

 (6) Bracliium conjunctivum (superior cerebellar peduncle) arising chiefly from 



dentate nucleus and cortex vermis. 

 (c) Decussation of brachium conjunctivum. 



4. Reo! nucleus and ventral |x>rlion of lateral nucleus of tlialamus. Some fibres of the 



brachium conjunctivum terminate in the red nucleus; many merely gi\ 



collaterals to it in passing to their termination in the tlialamus. Mo-t of the 



ascending fibres arising in the red nucleus also terminate in the ventral part 



of the thalamus. 



(a) Internal capsule, middle third, and fronto-parietal part of corona radiata. 



(6) Soma-sthetic area of cerebral cortex and probably cortex of frontal lobe 



anterior to it. 

 (e) Inferior peduncle of thalamus to cortex of temporal lobe. 



B. Dfsrrnilinif rirrhrn-ri rilnllur jmllix. 



1. Pyramidal cells of sonuest lict ic area send fibres through corona radiata. internal 

 capsule, and cerebral peduncle to nuclei of pons and arcuate nucleus of same and 

 opposite side. 



