THE NERVOUS SYSTEM OF THE OX 



837 



more than a third of the length of the hemisphere. The pattern of the fissures 

 and gyn of the paihmn is somewhat simpler than in the horse. 



ticaUv\^frH^n^''?L^^M'^^i ^°l l^^T'?'^ f ^"F ^'fP; ^^' '^'^'^^^ b^^nch extends almost ver- 

 of tariZr^Hth frnt,^h ^ °^ *^? ^^^""'^^ surface of the hemisphere, and is separated by a gyrus 

 with the suWrhr.X.'^P'^'^''^^'' 5?T?' . ^^^ ^"*^"°^ branch runs forward about parallel 

 litter a^emverpH^n anterior from which it is separated by the short gyri of the insula The 

 WchZav run h«l , Tf '''*'?* °?'y ^y the overhanging gyri (operculum). The posterior 



from tLTi'fprT.'n.T^J'^^f ^K^'"''^ ^' v'^fP '',°'^ ''''7 distinct. It extends in an undulating manner 

 irom the lateral surface of the occipital pole to the lateral side of the sagittal pole. Here it may 



Alarginal pole 



Cere- 

 bell u 



Olfactory Olfactory 

 Infundibulum tract bulb 



Hypophysis or pituitary body 



sa ' Corpus Pons 



Medulla trape- 

 oblongata zoideum 



Fig. 664. — Brain of Ox; Right View. 

 Fissures: 7, Lateral; ;?, 5, suprasylvian ; 3, coronal; 4. transverse; 5, ectomarginal; ff. diagonal; 7, posterior ecto- 

 sylvian; 8, presylvian; 9, 9', rhinal (anterior and posterior); P.ch., chorioid plexus of fourth ventricle; P.c, cerebral 

 peduncle; Z/.p., piriform lobe; 7, insula. Stumps of cranial nerves are designated by Roman numerals. 



be interrupted or may be continued by the coronal fissure, which descends to the frontal pole 

 and divides into two short branches. 



3. The diagonal fissure (S. diagonahs) begins in front of the stem of the lateral fissure and 

 runs upward and forward. Its form is very variable. 



4. The transverse fissure outs obhquely into the dorsal border in front of the sagittal pole. 

 It is short and deep and commonly communicates with the suprasylvian and coronal fissures, but 

 may be separated from the former. 



5. The marginal fissure is distinct. It extends from the sagittal pole to the occipital pole. 

 It is flexuous and deviates outward somewhat in its posterior two-thirds. 



6. The entomarginal fissure hes medial and parallel to the posterior part of the preceding. 



7. The ectomarginal fissure is lateral and parallel to the marginal fissure. It does not ex- 

 tend so far in either direction as the latter, and is often more or less broken up by annectant gyri. 



8. The sulcus rhinaUs is more open than in the horse, since it is not overlapped by the gyri 

 above it. 



9. Tfie calloso-marginal fissiu'e is flexuous and not so regular as in the horse. It is often 

 interrupted at or near the level of the genu of the corpus callosum, in which case the genual fissure 

 continues it downward. 



10. The cruciate fissure is faint and is confined to the medial surface. It lies about one centi- 

 meter in front of the transverse fissure, and commonly joins the calloso-marginal fissure below. 



