CRANIAL CAVITY. 



Lobes on the Upper Surface. The lingula consists of a few 

 gray folia prolonged from the superior vermis upon the upper 

 surface of the superior medullary velum and hidden in the an- 

 terior notch. The lobus centralis consists of the lobulus cen- 

 tralis (a small mass in the anterior notch) and the alse (two 

 expansions prolonged round the notch). The lobus culminis 

 consists of the culmen monticuli (the highest part of the ver- 

 mis) and the anterior crescentic lobules. The lobus clivi con- 

 sists of the clivus monticuli and posterior crescentic lobules. 

 The lobus cacuminis consists of the folium cacuminis and 

 posterior superior lobules. The crescentic lobules together 

 form the lobulus quadrangularis. [506] 



Lobes on the Lower Surface. The lobus noduli consists of 

 the nodule and the flocculi ; the latter are two small masses 

 lying on the upper surface of the middle peduncles and con- 

 nected with the nodule by the inferior medullary velum. The 

 lobus uvulce consists of the uvula (a triangular elevation) and 

 the tonsils; the latter are rounded and lie internal to the bi- 

 ventral lobules, each connected with the uvula, across the sul- 

 cus valleculse, by a gray ridge (furrowed band). The lobus 

 pyramidalis consists of the pyramid and the biventral lobules; 

 the latter lie just behind each flocculus, and are connected with 

 the pyramid, across the sulcus valleculse, by a faint ridge. The 

 lobus tuberis consists of the tuber valvular and the posterior 

 inferior lobules; each of the latter is divided by three fissures 

 into four parts, of which the two anterior form the lobulus 

 gracilis, and the two posterior form the lobulus semilunaris 

 inferior. [507] 



Internal Structure. It consists of gray matter covering a 

 central white mass ; the white matter of the vermis is the cor- 

 pus trapezoides. On antero-posterior section, the branching 

 white stems projecting from the central white mass into the 

 lobes form the arbor vitce cerebelli. At the centre of the white 

 core of each hemisphere lies a corrugated gray capsule (corpus 

 dentatum) with an opening (hilum) supero-internally. In 



[31] 



