冬天到來，各動物均出盡渾身解數迎接大自然給予的挑戰，譬如老生常談的燕子南遷及松鼠冬眠等等。850Please respect copyright.ＰＥＮＡＮＡ7CwjkDrMQn
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（圖2）而今次將要介紹的主角，就是體積非常細小的小臭鼩(Etruscan shrew)。850Please respect copyright.ＰＥＮＡＮＡfde59Mi7j0
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（圖3）冬天期間，小臭鼩(Etruscan shrew)的大腦皮層厚度會相應減少。850Please respect copyright.ＰＥＮＡＮＡu1dWVUADzL
從圖中可見，唯獨是L4區域有所縮細，其他區域並無顯著改變。850Please respect copyright.ＰＥＮＡＮＡMMLbzt8qNj
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（圖4）有趣的是，在夏天期間，若果食物供應不足夠的話，小臭鼩(Etruscan shrew)的大腦皮層厚度亦會相應減少。850Please respect copyright.ＰＥＮＡＮＡX0QTFkxxM9
但若果食物供應足夠的話，則不會出現「腦細」的情況。850Please respect copyright.ＰＥＮＡＮＡPSD20oH6mp
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（圖5）之所出現「腦細」的其中一個原因，相信是與新陳代謝有關。850Please respect copyright.ＰＥＮＡＮＡm6Mczd5MMC
對比其他區域，L4區域含有最高濃度的Cytochrome oxidase(CO)蛋白酶，850Please respect copyright.ＰＥＮＡＮＡUOGmeETGDQ
而CO蛋白酶的功用則為製造能源。850Please respect copyright.ＰＥＮＡＮＡIuaxNsCPA9
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這暗示出可能小臭鼩為了應對冬天食物短缺問題，所以索性盡量棄用與新陳代謝有關的部份，以作節省資源。850Please respect copyright.ＰＥＮＡＮＡ7JCR3ULO6U
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當然，亦不排除有其他的可能性。850Please respect copyright.ＰＥＮＡＮＡTou6p1CJTv
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（圖6）圖中為大腦皮層磁力共振得出的影像。850Please respect copyright.ＰＥＮＡＮＡEWTbMFwtww
藍綠色為冬天的時候，而橙黃色則為夏天時候。850Please respect copyright.ＰＥＮＡＮＡZq6LmcCXT5
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冬天和夏天的影像互相重疊後，橙黃色的區域較多，顯示夏天的腦部體積較冬天的為大。850Please respect copyright.ＰＥＮＡＮＡmeWoksrKfU
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平均來說，小臭鼩在冬天時候的大腦皮層厚度會縮減28%左右，但在下一年夏天的時候則會完全恢復回原有的厚度。850Please respect copyright.ＰＥＮＡＮＡoBZ8laK4q8
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如果想我快啲出文的話，請入去Penana網站科普專欄–薯不揀單俾一個like以及Bookmark，這對我非常之重要。850Please respect copyright.ＰＥＮＡＮＡ9WStUul2ez
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Link: https://www.penana.com/story/66244/%E7%A7%91%E6%99%AE%E5%B0%88%E6%AC%84-%E8%96%AF%E4%B8%8D%E6%8F%80%E5%96%AE/toc850Please respect copyright.ＰＥＮＡＮＡpGmnLsRfKq
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Link:850Please respect copyright.ＰＥＮＡＮＡ9Fi8XZe0uk
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio850Please respect copyright.ＰＥＮＡＮＡvH6fteJPA4
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有興趣接收科學資訊的話，歡迎follow IG: potatopigtongue。850Please respect copyright.ＰＥＮＡＮＡrmc6nMPxS3
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https://www.instagram.com/potatopigtongue/850Please respect copyright.ＰＥＮＡＮＡqjRAss8p6B
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Ref1:https://www.pnas.org/content/early/2020/11/24/1922888117850Please respect copyright.ＰＥＮＡＮＡqQOv8O6e4o
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