52 



LABORATORY OUTLINE OF NEUROLOGY 



distance between the cerebellar peduncles. In front of this 

 level in the isthmus region the roof is formed by a thin sheet of 

 nervous tissue, the anterior medullary velum (velum medullare 

 anterius). Behind this level the roof of the fourth ventricle 

 (legmen fossce rhomboidece) is a thin non-nervous membrane, a 

 part of which is highly vascular and much folded; this is the 



Face and tongue 



Head and eyes 



Fore limb 



Hind limb 



Gyrus sylviacus 

 (arcuatus) 



Gyrus lateralis 

 Gyri mediates 



Gyrus internus 



Vermis cerebelli -vA 



Hemisphserium 

 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). 



choroid plexus of the fourth ventricle. If this membrane is 

 intact, carefully pick it up with 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; Sobotta ('11), Figs. 650, 660; 

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



