Two types of Nervous Tissues
Motor Neuron
Motor neurons transmits messages from the central nervous system to all regions of the body. A motor neuron contains a myelin sheath with nodes of ranvier in between and the cell body is situated at the end of the cell. The direction of impulse goes form the dendrites to the synaptic knobs. |
Sensory Neuron
Sensory neurons transmit messages from the body to the central nervous system. A sensory neuron also contains a myelin sheath with nodes of ranvier separating it, however the cell body is situated in the milled of the cell and there are no dendrites on this structure. The direction of impulse goes from the synaptic knobs to the other end of the cell. (opposite to motor neuron) |
- Both of these neurons conduct impulses to muscles and glandular epithelial tissues.
- Inter-neurons neurons transmit messages from the sensory neurons to the motor neuron.
- They connect to form central networks of nerve fibers and are called "central" or "connecting neurons"
Synaptic action
Synaptic action is the process which an electrical impulse turns into a chemical impulse to cross the synaptic gap between nodes, then back to an electrical signal again.
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Salutatory Conduction
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Relaying messages around the animal body is one of the most important functions there is. This tell all the cells what to do, for example to move your arm a message needs to be send from the brain all the way to you arm before it can move. This message needs to be quick and traveling all the way down a nerve axon takes a lot of time. Salutatory conduction speeds this process up by the message jumping from node to node.
Never cells have a myelin sheath which is situated around the axon. The myelin sheath has little breaks which are called nodes of ranvier. These nodes is what helps to speed up the message.
The message is an electrical impulse, it starts at one end of the nerve and jumps down the nodes of ranvier to the other end before traveling to a different never cell. This jumping motion means the message is sped up as it does not need to travel the whole length of the axon.
Never cells have a myelin sheath which is situated around the axon. The myelin sheath has little breaks which are called nodes of ranvier. These nodes is what helps to speed up the message.
The message is an electrical impulse, it starts at one end of the nerve and jumps down the nodes of ranvier to the other end before traveling to a different never cell. This jumping motion means the message is sped up as it does not need to travel the whole length of the axon.