A homogeneous, relatively cell-poor, but fiber-rich layer of the cerebellar cortex consisting mainly of the axons of granule cells (i.e., parallel fibers), which lies directly under the pia mater, and above the granular layer. It also contains some basket and stellate interneurons. The axons bifurcate in a T-junction like wires on a telephone pole, extending some 2mm in opposite directions and running parallel to the long axis of a folium (hence their name). It is distinguished in terms of an external and an internal molecular layer.
See Basket cells, Cerebellar cortex, Cerebellum (anatomy), Golgi type II cells, Granule cells, Granular layer, Interneurons, Parallel fibers, Pia mater, Purkinje cell layer, Stellate cells