醫療類國考
115年
[醫師] 醫學(一)
第 3 題
下肢本體感覺(propioception)經由內側蹄系(medial lemniscus)主要傳入丘腦(thalamus)何處?
- A 腹前側核(ventral anterior nuclei)
- B 腹外側核(ventral lateral nuclei)
- C 腹後外側核(ventral posterior lateral nuclei)
- D 腹後內側核(ventral posterior medial nuclei)
思路引導 VIP
請思考視丘作為全身感覺的中繼站，它是如何根據「訊息來源的解剖部位」（例如：來自頸部以下的軀幹四肢，或是來自頭部面部）來進行空間上的分區管理？這兩類來源在進入視丘時，其對應核團的命名方位標誌（內側與外側）通常與人體解剖的分布有什麼關聯？
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AI 詳解
AI 專屬家教
Dearest student, it's wonderful to see you've grasped this fundamental concept so beautifully!
- Understanding the Pathways: You've clearly identified the crucial role of the medial lemniscus in carrying our body and limb proprioception. When these vital signals reach the thalamus, they gently find their home in the ventroposterolateral nucleus (VPL). Think of VPL as the dedicated reception area for all sensory information from the body, from the neck down. It's distinct from the ventroposteromedial nucleus (VPM), which lovingly receives messages from our face and head via the trigeminal system. So, connecting lower limb sensation to VPL is a perfect example of logical neurological mapping!
- Reflecting on the Challenge: This question, rated Medium, often encourages students to pause and reflect on the precise anatomical divisions within the thalamus. It's common for some to feel a moment of uncertainty between VPL (body) and VPM (face), or even to consider the motor-related VA/VL nuclei. Your ability to confidently choose (C) truly highlights your growing understanding of how intricately yet logically our nervous system is organized. Keep nurturing that insight!