344 



AN INTRODUCTION TO ZOOLOGY 



OL 



C H 



Sp.C. 



Cu 



FIG. 119. Brain of sheep, median longitudinal section. Transversely 

 running fibres indicated diagrammatically in wide cross hatching. 



A.C., anterior commissure ; A.M., anterior medullary velum, valve of Vieussens ; A. P., anterior 

 pillar of fornix ; A.Q., anterior quadrigeminal body ; A.V., arbor vitae ; Cb., cerebellum ; C.C., 

 corpus callosum ; C.Ce., canalis centralis ; C.H., cerebral hemisphere ; C.Ha., corpus habenulare ; 

 C.M., corpus mammillare ; Cr., crus cerebri ; F., body of fornix ; P.M., foramen of Munro ; G.C., 

 genu of corpus callosum ; G.Co., grey commissure ; H.C., hippocampal commissure ; I., iiifundi- 

 bulum ; It., iter ; L.T., lamina terminalis ; M., medulla; O.C., optic chiasma ; O.L., olfactory lobe ; 

 P. B., pineal body ; P.C., posterior commissure ; P.M., posterior medullary velum ; P.O., pre-optic 

 recess ; P.Q., posterior quadrigeminal body ; P.V., pons Varolii .; S.C., splenium of corpus callosum ; 

 S.Co., superior commissure ; S.L., septum lucidum ; Sp.C., spinal cord ; V.I., velum interpositum ; 

 III. third and IV. fourth ventricles. 



