A man in a car accident cannot feel his left leg but is able to contract the muscles there. Which component of the relevant spinal nerves or spinal cord region has been damaged?Multiple ChoiceDorsal rootVentral rootVentral hornLateral horn
Question
A man in a car accident cannot feel his left leg but is able to contract the muscles there. Which component of the relevant spinal nerves or spinal cord region has been damaged?Multiple ChoiceDorsal rootVentral rootVentral hornLateral horn
Solution
The correct answer is Dorsal root.
Here's the step-by-step reasoning:
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Sensory information (like feeling or sensation) from the body is transmitted to the central nervous system (the brain and spinal cord) through the dorsal roots of the spinal nerves.
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The fact that the man cannot feel his left leg suggests that there is damage to the sensory pathways, which are associated with the dorsal roots.
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The ability to contract the muscles in his leg indicates that the motor pathways, which are associated with the ventral roots and horns, are still functioning.
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The lateral horn is not relevant in this case as it is involved in the sympathetic nervous system, which controls involuntary functions like heart rate and digestion.
So, the damage is likely in the dorsal root, which carries sensory information.
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Which of the following would explain the loss of certain sensations from the skin of the posterior region of the upper limb?Multiple ChoiceOne or more ventral roots in the cervical region of the spinal cord have been damaged.One or more dorsal roots in the cervical region of the spinal cord have been damaged.One or more ventral roots in the thoracic region of the spinal cord have been damaged.One or more dorsal roots in the thoracic region of the spinal cord have been damaged.
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