270 



THE RHOMBENCEPHALON. 



duces a flat striated ridge, which may be seen easily in a well 

 hardened specimen. 



Structure of the Pons. The pons is composed of transverse 

 and longitudinal white fibers and of gray matter. The trans- 





Fig. 86. Dorsal surface of pons and medulla. (Morris's Anatomy modified from 



Spalteholz.) 



a. Median sulcus. b. Superior f ovea. c. Limiting sulcus. d. Medial eminence, e. Striae 

 medullares. f. Inferior fovea. g. Nucleus funiculi cuneati. h. Taenia of fourth ventricle, 

 i. Area postrema. j. Nucleus funiculi gracilis (clava). k. Posterior median fissure. 1. Aquae- 

 ductus cerebri. m. Nucleus incertus. n. Locus caeruleus. o. Colliculus facialis et nucleus 

 abducentis. p. Nucleus N. cochlearis (tuberculum acusticum). q. Area acustica (nucleus 

 vestibularis). r. Nucleus intercalatus. s. Trigonum N. hypoglossi. t. Alacinerea. u. Fu- 

 niculus separans. v. Obex. 



verse fibers are found chiefly in the basilar portion of the pons; 

 the longitudinal, in both the basilar and the dorsal part. The 

 anterior longitudinal intersect the deep transverse fibers of the 

 pars basilaris. 



