CEREBELLUM, PONS, AND MEDULLA. 



233 



3. Connections with Other Sensory Nuclei. — In addition to the 

 special sensory connections just described, it is stated by various 

 neurologists that the sensory nuclei of the vagus, the trigeminal 

 and the auditory nei'ves, send afferent paths into the cerebellum, 

 and that similar paths extend from the primary end stations of 

 the optic fibers.* 



4. Connections with the Cortex of the Cerebrum. — The cerebellar 

 cortex is connected with the cerebral cortex by the large system 



Fig. 104. — Diagram to indicate a possible descending path from cerebrum to cord in ad- 

 dition to the pyramidal system (Van Gehuchten, slightly modified). The path is indirect and 

 comprises the following units: 1. The cortico-ponto-cerebellar path, represented as arising in 

 the motor area of the cerebrum and passing down with the pyramidal system to end in the pons, 

 thence continued through the middle peduncles to the cerebellar cortex of opposite side. 2. 

 The path from the cerebellar cortex to the dentate nucleus. 3. The path from the dentate 

 nucleus to the red nucleus passing by way of the superior peduncles, brachium conjunctivum. 

 4. The path from the red nucleus to the motor cells of the spinal cord (rubrospinal tract). 



known as the cortico-ponto-cerebellar tract (see Fig. 82, A). The 

 fibers of this tract arise in the motor area of the cerebrum or in the 

 frontal cortex anterior to the motor area, descend in the internal 

 capsule and cerebral peduncle, and end in the gray matter of 

 the pons. Thence new axons continue the path across the mid- 

 * See Edinger, "Brain," 29, 483, 1906. 



