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  Spinal cord functioning

Spinal cord functioning:

The spinal cord stays as a connecting, functional nervous structure among the brain and sensory or effector organs. The sensory inputs received by sense organs are conducted towards suitable areas of the brain. Likewise from the brain motor sensations are transmitted towards effector structures. Further the brain, the spinal cord can affect motor initiation and bring about an effect. This activity is termed as reflex action.

Reflex action

Reflex action is the spontaneous involuntary response caused due to stimulation of receptor organ. Example, the quick closure of eye lid whenever some object touches the eyelashes. The sudden withdrawal of hand whenever the hand touches hot pan.

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                                                                  Figure: Route of reflex action

A reflex action is an involuntary procedure and does not include the intervention of consciousness. The anatomical base of reflex action is the reflex arc. This is a nerve chain among receptor organ and effector organ.

The reflex arc has the route as follows:

Sensory organ → sensory or afferent neuron → grey matter of the spinal cord → intermediary or relay neuron → efferent or motor neuron → effector organ.

 

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