Central Nervous System
- Cerebellar cortex:
- Molecular layer (cell processes, but few cells).
- Purkinje cell layer.
- Granule cell layer (densely packed small neurons) (underlying white matter).
- Cerebral neocortex:
- Molecular layer. Layers 2, 3, 4, 5, 6 with varying proportions of stellate, fusiform and small, medium, and large pyramidal cells (white matter).
- Resembles the spinal cord in having nerve cell bodies grouped in nuclei and nerve fibres in tracts.
- Some special nuclei of the brain stem and hypothalamus are:
- The reticular formation is an extensive system of groups of neurons serving many vital tasks, but whose nuclear organization is hard to discern.
- Neurons of the substantia nigra contain melanin pigment and dopamine.
- Certain hypothalamic nuclei have neurosecretory neurons.