Soru

20. In a 44-year-old female patient with a lesion in the left cerebral peduncle of the mesencephalon, which function loss is observed? (Remember the pathways in the cerebral peduncle and where the crossings occur.) A. Fine touch and pain sensation from the entire left side of the body B. Fine touch and pain sensation from the entire right side of the body C. Skeletal motor control provided to the entire left side of the body D. Skeletal motor control provided to the entire right side of the body E. Skeletal motor control provided to both sides of the body
Çözüm
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Elvan
Kıdemli · 9 yıl öğretmeniUzman doğrulaması
Cevap
The cerebral peduncle is a part of the midbrain that contains motor fibers that carry information from the cerebral cortex to the cerebellum and the spinal cord. The cerebral peduncle is divided into two parts: the ventral and dorsal peduncles. The ventral peduncle carries motor fibers from the cerebral cortex to the cerebellum, while the dorsal peduncle carries sensory fibers from the body to the cerebral cortex.
In the given scenario, the lesion is in the left cerebral peduncle of the mesencephalon. This would affect the motor fibers that carry information from the cerebral cortex to the cerebellum and the spinal cord. Since the cerebral peduncle is responsible for carrying motor fibers, the function loss observed in this patient would be related to skeletal motor control.
The cerebral peduncle is also where the corticospinal tract crosses. The corticospinal tract is responsible for carrying voluntary motor commands from the cerebral cortex to the spinal cord. The majority of the fibers in the corticospinal tract cross at the level of the medulla oblongata, but a smaller percentage of fibers remain uncrossed and continue down the spinal cord. The uncrossed fibers are responsible for carrying motor commands to the contralateral (opposite) side of the body, while the crossed fibers carry motor commands to the ipsilateral (same) side of the body.
Since the lesion is in the left cerebral peduncle, it would affect the motor fibers that carry information from the cerebral cortex to the cerebellum and the spinal cord. This would result in a loss of skeletal motor control provided to the entire right side of the body, as the motor fibers that carry information to the right side of the body would be affected by the lesion.
Therefore, the correct answer is D. Skeletal motor control provided to the entire right side of the body.
In the given scenario, the lesion is in the left cerebral peduncle of the mesencephalon. This would affect the motor fibers that carry information from the cerebral cortex to the cerebellum and the spinal cord. Since the cerebral peduncle is responsible for carrying motor fibers, the function loss observed in this patient would be related to skeletal motor control.
The cerebral peduncle is also where the corticospinal tract crosses. The corticospinal tract is responsible for carrying voluntary motor commands from the cerebral cortex to the spinal cord. The majority of the fibers in the corticospinal tract cross at the level of the medulla oblongata, but a smaller percentage of fibers remain uncrossed and continue down the spinal cord. The uncrossed fibers are responsible for carrying motor commands to the contralateral (opposite) side of the body, while the crossed fibers carry motor commands to the ipsilateral (same) side of the body.
Since the lesion is in the left cerebral peduncle, it would affect the motor fibers that carry information from the cerebral cortex to the cerebellum and the spinal cord. This would result in a loss of skeletal motor control provided to the entire right side of the body, as the motor fibers that carry information to the right side of the body would be affected by the lesion.
Therefore, the correct answer is D. Skeletal motor control provided to the entire right side of the body.
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