WHITE MATTER OF MEDULLA. 



295 



The dorsal part of the anterior area is occupied by the substan- 

 tia reticularis alba (Figs. 92 and 93)* It contains the bodies 

 of very few nerve cells and is of a light color. The medial acces- 

 sory olivary nucleus is imbedded in it near the pyramid and among 

 the fibers of the fillet; and three definite bundles of longitudinal 



Fig. 92. Section of medulla oblongata near the pons. (Original.") 



a. Hypoglossal nucleus, b. Vestibular nucleus, c. Tractus solitarius. d. Restiform 

 body. e. Substantia reticularis. f . Hilus of olivary nucleus containing cerebello-olivary 

 fibers, g. Anterior lateral sulcus. h. Pyramid, i. Anterior median fissure, j. Anterior 

 longitudinal bundle, k. Medial longitudinal bundle. 1. Nuc. tractus spinalis n. trigemini. 

 m. Tractus spinalis n. trigemini. n. Lateral cochlear nucleus, o. Ventral cochlear nucleus. 

 p. Ascending anterior cerebello-spinal, spino-thalamic, and rubro-spinal tracts, q. Posterior 

 lateral sulcus. r. Medial fillet, interolivary stratum, s. Anterior external arcuate fibers. 

 t. Arcuate nucleus. 



fibers have been demonstrated in it, namely, the medial fillet 

 and the medial and anterior longitudinal bundles. 



Medial Fillet (Lemniscus Medialis}. Just dorsal to the pyramid 

 in the anterior area of the medulla at the level of the olives, is a 

 large bundle of fibers called the interolivary stratum of the fillet 



