Which of the following statements doesn't belong to the channel system? A: The Eight Extraordinary Vessels B: The Twelve Regular Channels C: The sinew D: The collateral vessles

What are NOT the correct descriptions of the postganglionic fibers? A: They are the axons of the postganglionic neurons. B: They may surround the artery as parts of nerve plexus. C: They may accompany with the corresponding spinal nerve to the peripheral blood vessles, sweat gland and arrector pilli muscles. D: They may relay in corresponding ganglion. E: They may terminate directly in certain organs.