Changes

==The Nerve Fibre==

==The Nerve Fibre==

 

The nerve fibre consists of the: the '''[[#The Axon|axon]]''' which carries impulses, '''[[#The Schwann cell|Schwann cells]]''' which ensheath the axon and the '''basal lamina''' which surrounds the Schwann cells.

* The nerve fibre consists of the:

** [[#The Axon|Axon]]

*** Carries impulses

===The Axon===

** [[#The Schwann cell|Schwann cell]]

The axon consists of an outer membrane, called the '''axolemma'''. The '''axoplasm''' is contained within the axolemma and is continuous with the cytoplasm of the neuron. There are no ribosomes (free or attached to the ER) and therefore no protein synthesis can take place in the axon. All protein required for the maintenance of the axon depends on proteins being imported from the cell body.The '''cytoskeleton''' is a key feature of the axon, which consists of two key elements:

*** Ensheaths the axon

** Basal lamina

*** Surrounds the Schwann cell

 

===<u>The Axon</u>===

 

* The axon consists of:

** An outer membrane, called the axolemma.  

** The axoplasm.

*** This is contained within the axolemma.

*** Itis continuous with the cytoplasm of the neuron.  

** '''NO''' ribosomes (free of attached to the ER).

*** Therefore no protein synthesis can take place in the axon.

*** All protein required for the maintenance of the axon depends on proteins being imported from the cell body.

** The cytoskeleton.

*** This is a key feature of the axon, which consists of two key elements:

***#'''Neurofilaments'''

***#'''Neurofilaments'''

***#* Neurofilaments are the axon's intermediate filaments.

***#* Neurofilaments are the axon's intermediate filaments.