Question

fill in the blank question
35 of 42 concepts completed
all spinal nerves (except the first one) have two roots. the anterior roots consist of motor fibers (axons) while posterior roots consist of blank fibers
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Explanation:

• Anterior (ventral) spinal nerve roots contain motor (efferent) axons that carry signals from the spinal cord to muscles/glands.
• Posterior (dorsal) spinal nerve roots contain sensory (afferent) axons that carry sensory information (like touch, pain, proprioception) from the periphery to the spinal cord. This is a fundamental concept in neuroanatomy (within the subfield of Biology, specifically Human Anatomy/Neuroscience).

Answer:

For the first blank (after "motor"): "efferent" (or the full term "motor efferent" is also correct in context, but the key term here is related to motor fibers being efferent, and for the second blank (posterior roots): "sensory (afferent)"