Rule of 3: Cerebellum

Rule of three 

Cerebellum

 Rule of three applies in cerebellum where it can be divided in 3 zones based upon its fucntion and phylogey. Similarly, three lobes are formed by primary and posterior fissures. The cerebellum is suppied by three arteries viz Superior cerebellar artery (SCA) and Anterior inferior cerebellar artery (AICA) both branches of basilar artery while posterior inferior cerebellar artery (PICA) is a branch of pair of ascending vertebral arteries.  On cellular level  the superficial layers are formed by basket cells and stellate cells forming the molrcular layer. These cells project into Purkinjee fibers which are the inhibitory cells releasing GABA and project into the deep nucleus. Deep Nucleus includes Globose, Emboliform , Dentate and Fascitigeal nuclei. 

There are three surfaces anatomically the superior or the tentorial surface beneath the tentorium cerebri. Lateral Surface covered by the petrosal bone and posterior by the occipital bones.