THE CEREBRUM 



409 



upwards ; anteriorly, by the central sulcus ; and, posteriorly, 

 by the lateral part of the parieto-occipital fissure and a line 

 prolonged from it to the pre-occipital notch on the infero- 

 lateral border of the hemisphere (Figs. 155, 177). 



Anterior central gyrus 

 Central sulcus 

 Posterior central gyrus ' . 



Upper post-central sulcus 

 Supra-marginal gyrus 

 Interparietal sulcus (proprius) 



Angular gyrus 

 Post-parietal gyrus 



Paroccipital sulcus 

 Arcus parieto- 

 occipitalis 

 Parieto-occipital ', 

 fissure 



Upper precentral sulcus 

 ,' Lower precentral sulcus 



Superior frontal sulcus 

 ," Superior frontal gyrus 



Middle frontal gyrus 



Inferior frontal suli 



Calcarine 



fissure ' 

 Sulcus lunatus 



Transverse occipital 

 sulcus 



Olfactory bulb 

 \ Inferior frontal gyru: 



Anterior horizontal branch 

 lateral fissure 

 Anterior ascending branch 

 I | of lateral fissure 



1 Posterior branch of lateral fissure 

 Superior temporal gyrus 



Lateral occipital sulcus 

 Horizontal sulcus of cerebellum 



Right hemisphere of cerebelh 



Part of cerebellum which extends into foramen magnum 



Olive of medulla oblongata 



FIG. 155. Lateral surface of Right Half of the Brain (semi-diagrammatic). 

 The horizontal dotted line completes the separation between the parietal 

 and temporal areas, and the oblique dotted line, which runs from the 

 parieto-occipital fissure to the pre-occipital notch, separates the occipital 

 from the parietal and temporal areas. 



The Sulci of the Supero laieral Surface of the Parietal Lobe. 

 The sulci of the supero-lateral surface of the parietal lobe are 

 the post-central sulci, the interparietal sulcus proper, and the 

 par-occipital sulcus. 



Sulci Postcentrales. There are two post-central sulci a 

 superior and an inferior. They are developed independently, 



