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The diagram given below is a representat...

The diagram given below is a representation of a phenomenon pertaining to the nervous system. Study the diagram and answer the following questions:

(i) Name the phenomenon that is being depicted.
(ii) Give the technical term for the point of contact between the two nerve cells.
(iii) Name the parts A, B, C and D.
(iv) Write the functions of parts E and F.
(v) How does the arrangement of neurons in the spinal cord differ from that of the brain.

Text Solution

Verified by Experts

(i) Reflex action/Reflex arc/ Nervous pathway of Reflex action.
(ii) Synapse
(iii) Different parts are labelled as :
A - Sensory / Afferent fibre / Axon of sensory neuron
B - Dorsal root ganglion/ aggregates of cell bodies of sensory neuron.
C-White matter
D-Grey matter
(iv) E - Carry impulses from (operative) sensory neuron to motor neuron.
F - Carry impulses from
(operative) central nervous system/brain and spinal cord/to effector /muscle/ gland.
(v) In spinal cord - cytons are in the inner grey matter and axons in the outer white matter. In brain - cytons are in the outer grey matter and axons in the inner grey matter.
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