Question

Write about Afferent pathway, Dorsal root ganglion, Efferent pathway, Motor neuron.

Answer 1

Given diagram shows reflex arc. The whole mechanism of reflex action occurs in such a fashion that there is no conscious control of the brain. Stimulation occurs through the peripheral nervous system and the response to this peripheral nerve stimulation is involuntary. In a reflex action, the spinal cord along with the brain stem is responsible for the reflex movements.

Afferent pathway has nerve fibres that carry signals from the somatic receptors to the posterior horn of the spinal cord or to the brainstem. The efferent pathway consists of nerve fibres that carry motor nerve signals from the anterior horn to the muscles. The motor neuron carries efferent impulses to the effector, which produces the responsefibresdorsal root ganglia (DRG) are a collection of cell bodies of the afferent sensory fibres, which lie between adjacent vertebrae. They are activated by a variety of sensory stimuli that are then transmitted to the central nervous system.