ANATOMY AND PHYSIOLOGY OF NERVOUS SYSTEM. 



G2' 



an appearance analogous to that of a writing pen; hence its name: 

 calamus scriptorius. The space between the restiform bodies pre- 

 sents a median groove. Above it passes over the posterior face of 

 the pons; below it is arrested by the point of divergence of the resti- 

 form bodies. This is known as the groove of the calamus scriptorius. 

 From each side of this groove there proceed white transverse fibers 

 whose direction is at right angles to that of the groove. They are 

 known as the barbce of the calamus, or auditory strice. These fibers 

 are the posterior roots of the auditory nerve. 



678 



Xff 



14 



Fig. 242. Diagrammatic Transverse Section of the Spinal Bulb X 3, 

 at about the middle of the olivary body, to illustrate the principal 

 nuclei and tracts at that level. (WALLER, after SCIIWALBE.) 



1, Nucleus cuneatus. 2, Nucleus gracilis. 3, Vagus nuclei. 4, Hypoglossal 

 nucleus. 5, Funiculus teres. 6, Funiculus solitarius. 7, Funiculus gracilis. 

 8, Funiculus cuneatus. 9, Restiform tract. 10, Substantia gelat. Ro. 11, Spinal 

 root o'f fifth nerve. 12, Antero-lateral nucleus. 13, Olivary body. 14, Anterior 

 pyramid. 



The restiform bodies, which seem to form the limits of the floor 

 )f the fourth ventricle on each side of the calamus scriptorius, come 

 ip from the posterior columns of the cord. They ascend upward 

 md outward toward the cerebellum. 



The columns of Goll and Burdach of the spinal cord as they 

 mtor the lower portion of the posterior aspect of the medulla seem 

 be divided into several distinct tracts. Bordering upon the pos- 

 ;rior median fissure is the column of Goll. As the tract approaches 

 fourth ventricle it broadens out to form the expansion known as 

 ie clava. The two clava? diverge to form the nib of the calamus 

 ;riptorius. 



