Changes

===Axoplasmic Transport===

===Axoplasmic Transport===

*Neurones are very large cells and most of a neurones cytoplasm is present in its processes while most of the cells RNA is located in cell body (Nissl substance).  

*Neurons are very large cells and most of a neurons cytoplasm is present in its processes while most of the cells RNA is located in cell body (Nissl substance).  

*These cells have therefore evolved mechanisms to transport large macromolecules and organelles up and down processes.

*These cells have therefore evolved mechanisms to transport large macromolecules and organelles up and down processes.

====Axoplasmic Transport====

====Axoplasmic Transport====

* Neurones are very large cells.

* Neurons are very large cells.

** A high proportion of a neurons cytoplasm is present in its processes.

** A high proportion of a neurons cytoplasm is present in its processes.

** However, the cell's protein producing machinery (the Nissl substance) is located in the cell body.

** However, the cell's protein producing machinery (the Nissl substance) is located in the cell body.

* During development of the nervous system, Schwann cells interact with many small axons.  

* During development of the nervous system, Schwann cells interact with many small axons.  

** Schwann cells eventually relate to only one axon, as axonal diameter increases with maturation of the system.

** Schwann cells eventually relate to only one axon, as axonal diameter increases with maturation of the system.

***[[Neurones - Anatomy & Physiology#Oligodendrocytes|Oligodendrocytes]], that myelinate the CNS, differ from Schwann cells in that they interact with many axons.  

***[[Neurons - Anatomy & Physiology#Oligodendrocytes|Oligodendrocytes]], that myelinate the CNS, differ from Schwann cells in that they interact with many axons.  

====The Process of Myelination====

====The Process of Myelination====