50 



LABORATORY OUTLINE OF NEUROLOGY 



forceps or float it out under water and determine the line of its 

 attachment to the massive wall of the medulla oblongata on 

 each side. This line of attachment is the tcenia of the fourth 

 ventricle (see Fig. 11; Morris ('14), 5th ed., Fig. 639; Spalteholz 

 ('09), Figs. 695, 703). 



Note that immediately behind the cochlear nucleus the 

 taenia turns abruptly to the lateral margin of the medulla ob- 



Face and tongue 



Head and eyes 



Fore limb 



Hind limb 



Gyrus sylviacus 

 (arcuatus) 



Gyrua lateralis 

 Gyri mediales 



Gyrus internus 



Vermis cerebelli — 



Hemisphaerium 

 cerebelli 



Medulla spinalis 



Gyrus frontalis 



medialis 

 Gyrus frontalis 



superior 



Sulcus coronalis 



— Sulcus splenialis 



Fissura ansata 



(cruciata) 

 Fissura lateralis 



(Sylvii) 

 Fissura suprasylvia 



Fissura 



longitudinalis 

 Sulcus lateralis 



Sulcus intermedius 



Sulcus medialis 



Flocculus 



Nervus accessorius 

 Nervus spinalis I 



Fig. 9. — The brain of the sheep seen from the dorsal side. Slightly 

 reduced. On the left side the areas of electrically excitable motor cortex 

 are shown after the researches of Simpson and King (1911). 



longata, thus forming the lower boundary of a wide expansion of 

 the fourth ventricle, the lateral recess, which extends dorsally 

 over the cochlear nucleus. 



51. The fossa rhomboidea. — Next remove the membranous 

 roof of the fourth ventricle of the sheep and examine carefully 



