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What is Wrong statement regarding grey rami communicates is and explain in detail?
Gray ramus means - Non myelinated fibers, so answer can be picked up easily as all pre-ganglionic fibers are Myelinated - white ramus Lateral horn cell gives sympathetic Neuron fibers which passes through ventral root of the spinal cord & enters spinal Nerve; passes through distal white ramus & enter Splanchnic N & then synapse in preveebral ganglion which controls the effectors sending post- ganglionic Nerves to viscera (eg. If sent to stomach, it decreases the peristalsis of stomach &| ses stomach distension). Lateral Horn cell sends fibers through ventral root of spinal cord |enter Spinal N - enter sympathetic chain & synapses here (distal white ramus), which gives - Post ganglionic fiber (non-Myelinated, hence gray ramus) - reenter spinal N - go & supply sweat glands in the skin. Gray Ramus is proximal & medial to distal white ramus. Pain of the skin is carried by sensory nerve, enter spinal N from here goes to dorsal root ganglion - enter dorsal root - synapse in posterior Horn cell - crosses midline & continue as lateral spinothalamic tract Thus, Dorsal root ganglionic not only receives visceral sensations, it is also receives cutaneous sensations. Distal white ramus carries pre-ganglionic fiber, not gray ramus.