666 



A TEXTBOOK OF PHYSIOLOGY 



4. Anterior horn group groups of large multipolar cells from 

 which the efferent fibres of the anterior root arise. 



The white matter of the spinal cord consists of tracts of fibres 

 which run mainly up and down. There are fibres (1) from the 

 posterior root ganglia of the spinal nerves, which ascend or dessend 

 in the spinal cord; (2) from the grey matter of the spinal cord, which 

 ascend to the brain ; (3) from the grey matter of the brain, which 

 descend to the spinal cord; (4) commissural fibres which connect 

 various parts of the spinal cord. The corresponding tracts are 



Postero-lateral fissure 

 Postcro-niedian column 



Postero-median fissur 

 Posterior root bundle 

 Postero-lateral column 



Subst. gelat. of 

 dorsal horn 



Bundle of Flechsig 



Lateral (crossed ) 

 pyramidal tract 



Form, retic 

 Lateral horn ^ 

 Central canal V 

 Commissure 



Anterior horii ^ 



Antero-mediau fissure-" 



FIG. 394. SECTION OF HUMAN SPINAL CORD FROM UPPER CERVICAL RKGIOX. 

 PHOTOGRAPH MAGNIFIED ABOUT 8 DIAMETERS. (E. A. Schafer, from " Quain's 

 Anatomy." ) 



1. Ascending. The postero-median tract (of Goll); the postero- 

 lateral tract (of Burdach) ; the marginal tract (of Lissauer). 



Descending. The comma tract. 



2. Ascending. The dorsal spino-cerebellar (or the direct or 

 posterior cerebellar tract of Flechsig); the ventral spino-cerebellar 

 (or ascending antero-lateral or ventral cerebellar tract of Go wers); 

 the spino-thalamic. 



3. Descending. The cortico-spinal or pyramidal tract (en 

 uncrossed, or direct); the rubro-spinal tract (prepyramidal of Moua- 

 kow); the vestibulo-spinal tract (antero-lateral descending of Loewen- 

 thal); the olivo-spinal tract, the thalamo-spinal tract (of Helweg). 



4. Ascending and Descending. The septo-marginal tract; fibres of 

 the basis bundles. 



