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.
Question
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.
Solution
The correct answer is: One or more dorsal roots in the cervical region of the spinal cord have been damaged.
Here's why:
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Sensations from the skin are transmitted to the brain through sensory neurons, which enter the spinal cord via the dorsal roots. Therefore, damage to the dorsal roots can result in loss of sensation.
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The upper limb, including the posterior region, is innervated by nerves that originate from the cervical region of the spinal cord. Therefore, damage in this region can affect sensations in the upper limb.
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The ventral roots of the spinal cord are involved in transmitting motor signals from the brain to the muscles, not sensory signals from the skin to the brain. Therefore, damage to the ventral roots would not result in loss of sensation.
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The thoracic region of the spinal cord primarily innervates the trunk of the body, not the upper limbs. Therefore, damage in this region would not typically result in loss of sensation in the upper limbs.
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