Question

fill in the blank question
the first pair of spinal nerves is purely, while the rest are, containing both motor and sensory fibers.
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Explanation:

To solve this, we recall knowledge about spinal nerves. The first pair of spinal nerves (C1) is purely motor (it innervates neck muscles without significant sensory input from the skin, mainly motor for neck movement). The rest of the spinal nerves are mixed nerves, meaning they contain both motor (efferent) and sensory (afferent) fibers, carrying signals to and from the spinal cord.

Answer:

The first blank: motor; The second blank: mixed