The nerve impulse

When receptors or sense organs are stimulated, an impulse is initiated that is transmitted along the sensory nerve towards the spinal cord and brain.

The brain then decides upon the corrective action and initiates impulses that are transmitted along the motor nerves to appropriate muscles or glands. Impulses are transmitted in axons

Nissl granule

Dendrites

Axon membrane or neurilemma

Myelin sheath

Node of Ranvier

Muscle (effector)

Dendrites

Axon membrane or neurilemma

Myelin sheath

Node of Ranvier

Muscle (effector)

Dendron

Cell body

Motor axon terminals (end plate) in muscle

Dendron

Cell body

Sensory axon terminals in spinal cord

Axon

Dendron -Myelin sheath-

Motor axon terminals (end plate) in muscle

Cell body

Cell body

Nucleus

Meissner's corpuscle (receptor)

Dendrites

Dendrites

Dendron

Meissner's corpuscle (receptor)

Dendrites

Dendrites

Dendron

Cell body

- Direction of nerve impulse

Figure 2.19 Types of neurone: (a) motor neurone (b) sensory neurone (c) inter neurone.

Axon terminal

Axon terminal

Postsynaptic Presynaptic membrane membrane of of dendrite of first neuron next neuron

Figure 2.20 Conduction of nerve impulse across synapse.

Postsynaptic Presynaptic membrane membrane of of dendrite of first neuron next neuron

Figure 2.20 Conduction of nerve impulse across synapse.

and dendrites in one direction only as shown in Figure 2.20. More than one neuron will be involved in the transmission of a nerve impulse and the point at which the impulse passes from one neuron to another is called a synapse.

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