A patient has a spinal cord injury that interrupts nerve fibres carrying voluntary motor commands from the brain to the legs. Which pathway is most directly affected?
Correct answer: B. Descending motor pathway
- A. Ascending sensory pathway
- B. Descending motor pathway
- C. Visceral sensory pathway
- D. Cranial sensory pathway
Explanation
Descending motor pathways carry commands from the brain toward spinal motor neurons and skeletal muscles. Ascending pathways carry sensory information toward the brain, so they do not directly transmit voluntary movement commands.
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About Nervous System and Special Senses
The nervous system covers neurons, neuroglia, nerve impulses, synapses, reflex arcs, and the organization of the central and peripheral nervous systems. It also explains the autonomic divisions and the receptors and pathways for vision, hearing, balance, taste and smell, distinguishing sensory reception from conscious perception.
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