A) 30
B) 31
C) 33
D) 32
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The correct answer is B) 31
The spinal nerves are a part of the peripheral nervous system, which connects the spinal cord to the rest of the body.
The spinal cord is divided into 31 segments: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal.
Each segment gives rise to a pair of spinal nerves that exit the spinal cord through the intervertebral foramina, which are the small openings between the vertebrae. These spinal nerves are responsible for relaying information between the brain and the rest of the body.
The spinal nerves are grouped into 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal nerves. The cervical nerves are responsible for controlling the head, neck, and upper limb movements, thoracic nerves are responsible for the chest, abdominal muscles, and the diaphragm, Lumbar nerves are responsible for controlling the lower limb movements, sacral nerves control the hip and leg movements, and the coccygeal nerve is not considered as a spinal nerve since it is the last nerve and it is not paired.
The number of pairs of spinal nerves is 31 pairs (8 cervical+12 thoracic+5 lumbar+5 sacral+1 coccygeal =31).
So the correct answer is B) 31. The spinal cord is divided into 31 segments and each segment gives rise to a pair of spinal nerves, which exit the spinal cord through the intervertebral foramina. The number of pairs of spinal nerves is 31 pairs.