A man was in an accident and severed his spinal cord between C6 and C7. Which of the following would NOT occur?loss of sensation in the trunk below the shoulders, the lower limbs and portions of the armsloss of use of the phrenic nerves and paralysis of the diaphragmloss of movement in the lower limbsloss of the use of the intercostals nerves, and breathing would be affected because the intercostals muscles would be paralyzedloss of sensation and movement in the jaw
loss of use of the phrenic nerves and paralysis of the diaphragm
Loss of sensation and movement in the jaw would not occur. The jaw is innervated by the trigeminal nerve (CN V), which is not affected by the spinal cord injury at the C6-C7 level. The other options, however, are likely to occur due to the loss of motor and sensory function below the level of the injury. The phrenic nerve, which innervates the diaphragm, arises from C3-C5, and can be affected in injuries at or above the C5 level, leading to paralysis of the diaphragm and difficulty breathing. The intercostal nerves, which innervate the intercostal muscles used in breathing, arise from the thoracic spinal cord segments, below the level of the injury. Therefore, loss of sensation in the trunk below the shoulders, the lower limbs, and portions of the arms, as well as loss of movement in the lower limbs would be expected due to the spinal cord injury.
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