Choose the correct answer from each of the four options given below:
The numbers of Spinal nerves in the human being are:
Topic: Number of spinal nerves
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Answer
(a) 31 pairs.
31 PAIRS of spinal nerves arise from the spinal cord.
Learn the two figures together, since papers offer both: CRANIAL nerves — 12 pairs, arising from the BRAIN SPINAL nerves — 31 pairs, arising from the SPINAL CORD
Note the word PAIRS. The nerves are paired, one of each on either side of the body — so 31 pairs, not 31 nerves. When a question offers the same number with and without "pairs", the answer is almost always the one WITH it.
Every spinal nerve is a MIXED nerve, formed by the union of a DORSAL root (sensory) and a VENTRAL root (motor) just outside the cord — which is why it carries impulses in both directions.
31 pairs.