MEDULLA OBLONGATA OF AMBLYSTOMA 



421 



Fig. 44 Transverse section at the level of the vagus roots, illustrating two 

 neurones related with correlation tract 6. Golgi method. X 100. Other sections 

 show similar neurones which send dendrites into tract b and also jnto the area 

 acustico-lateralis farther dorsally. 



Fig. 45 A neurone of the ganglion semilunars (Gasseri) of larval Ambh^stoma, 

 from the same specimen as figure 56. The central process is directed to the left, 

 the peripheral process to the right. Method of Ram6n y Cajal. X 225. 



Fig. 46 Horizontal section through the left anterior lateralis VII ganglion of a 

 38 mm. larva, illustrating unipolar and bipolar neurones of large and small size. 

 Most of the small oval nuclei »f the neurilemma are omitted from the drawing. 

 The proximal end of the ganglion is at the right. Method of Ramon y Cajal. 

 X 200. 



Fig. 47 Parasagittal section through the isthmus region illustrating the way in 

 which fibers of the spinal lemniscus complex (tr.sp.t.) give off collaterals to the 

 tegmentum of the oblongata {ir.sp.b.), to the cerebellum (tr.sp.cb.), and to the 

 tectum (tr.sp.t.). Golgi method. X. 100. 



