252 



THE NERVOUS SYSTEM 



and the restiform bodies, are the lateral fasciculi, or thefuniculi of 

 Rolando. They constitute the upward prolongation of all the 

 antero-lateral portion of the cord which does not go to the for- 

 mation of the anterior pyramids. Their chief importance is in 

 the fact that they contain the centers for respiration. The 



FIG. 79. Floor of the 4th ventricle and the connections of the cerebellum. 



On the left side the three cerebellar peduncles are cut short; on the right the con- 

 nections of the superior and inferior peduncles have been preserved, while the middle 

 one has been cut short, i, median groove of the 4th ventricle with the fasciculi 

 teretes; 2, the striae of the auditory nerve on each side emerging from it; 3, inferior 

 peduncle; 4, posterior pyramid and clava, with the calamus scriptorius above it; 5, 

 superior peduncle; 6, fillet to the side of the crura cerebri; 8, corpora quadrigemma. 

 (Landois.) 



posterior pyramids are sometimes called the funiculi graciles. 

 They join the restiform bodies and pass to the cerebellum. 



The fourth ventricle deserves paricular attention. It is a 

 cavity on the posterior aspect of the pons and medulla extending 

 from the upper limit of the former to a point on the latter oppo- 

 site the lower border of the olivary body. It has the shape of 

 two isosceles triangles placed base to base. The apex of the 

 inferior triangle is at the calamus scriptorious, and its lateral 

 boundaries are eht diverging restiform bodies. The superior 



