Their dendrites reach the molecular layer and have multiple branches. The Purkinje layer consists of Purkinje cells, which are large Golgi type I neurons. The molecular layer contains two types of neurons: the outer stellate cell and the inner basket cell. The gray matter of the cortex divides into three layers: an external - the molecular layer a middle - the Purkinje cell layer and an internal - the granular layer. Each fold is composed of an inner white matter core that is covered by gray matter. The cerebellar cortex is a sheet-like structure, made of a single sheet less than 1mm thick, and accordion-like folds fused at the midline (Essen 2018). The cerebellum is neuron-rich, containing 80% of the brainвЂ™s neurons organized in a dense cellular layer. A deep horizontal fissure found within the posterior lobe separates the superior and inferior surfaces of the cerebellum. The V-shaped primary fissure separates the anterior and posterior lobe, while the posterolateral fissure separates the posterior and flocculonodular lobes. It is composed of two hemispheres joined by the vermis and is sub-divided into three lobes вЂ“ anterior, posterior, and flocculonodular, which are separated by two transverse fissures. Tentorium cerebelli, an extension of the dura matter, separates the cerebellum from the cerebrum. The cerebellum, which is the largest part of the hindbrain, is located in the posterior cranial fossa, behind the fourth ventricle, the pons, and the medulla oblongata.

Fissures of the brain