FUNCTIONAL PARTS OF THE NERVOUS SYSTEM 



79 



ments of the body. It probably has less to do with sensation than any 

 other part of the brain. Luciani, indeed, claims that the cerebellum may 

 be called the organ of subconsciousness, coordinating the bodily func- 

 tions independently of the deliberate will and without the consciousness 

 of the individual. It may be supposed, then, that the movements which 

 are directly under the control of the spinal cord are properly coordinated 



FIG. 43 



Diagram of a human neural "segment:" 1, the cord's ventral (anterior) median fissure; I 1 , 

 dorsal (posterior) median fissure; 2, ventral root (efferent and perhaps motor); 3, dorsal root 

 (afferent and perhaps sensory); 4, spinal ganglion; 5, trunk of the spinal nerve; 6, dorsal limb 

 of the same; 7, ventral limb of the same; 8, ramus communicans; 9, meningeal branch; 10, 

 sympathetic ganglion; 11, lateral cutaneous branch; 12, dorsal limb, and 13, ventral limb of the 

 ;; 14, ventral cutaneous branch; 15, medial limb, and 16, lateral limb of the same. (Rauber.) 



by the cerebellum with each other and with the multitude of influences 

 which come from the cerebrum. The function that has long been 

 accorded to the cerebellum (maintenance of the equilibrium of the body) 

 is only one of many similar functions, for all involve coordination. 



The Spinal Cord. The spinal cord is the great distributing and con- 

 ducting portion of the nervous system, and is the seat also of many 



