Brain of the African elephant (Loxodonta africana):: Neuroanatomy from magnetic resonance images
Brain of the African elephant (Loxodonta africana):: Neuroanatomy from magnetic resonance images
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DOI：
10.1002/ar.a.20255
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发表时间：
2005-11-01
期刊：
影响因子：
--
通讯作者：
Allman, JM
中科院分区：
文献类型：
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作者：
Hakeem, AY;Hof, PR;Allman, JM
我们获得了成年非洲象Loxodonta afficana在轴向和矢状面上的大脑磁共振图像，并产生了解剖学标记的图像。我们量化了整个大脑(3886.7厘米(3))以及新皮质和小脑灰质和白质的体积。大象新皮质和小脑中的白质与灰质的比例与这种大小的大脑预期的比例是一致的。在大象和人脑中，新皮质灰质体积与胼胝体横截面积的比率相似(分别为108和93.7)，这强调了陆地哺乳动物和鲸目动物之间的差异，因为相对于新皮质灰质体积，陆地哺乳动物和鲸目动物的胼胝体体积非常小(在我们的样本中，比率为181-287)。最后，与灵长类动物，尤其是鲸目动物相比，大象的海马体异常大而曲折。这可能与大象极长的社会和化学记忆有关。(C)2005年Wiley-Liss，Inc.
We acquired magnetic resonance images of the brain of an adult African elephant, Loxodonta afficana, in the axial and parasagittal planes and produced anatomically labeled images. We quantified the volume of the whole brain (3,886.7 cm(3)) and of the neocortical and cerebellar gray and white matter. The white matter-to-gray matter ratio in the elephant neocortex and cerebellum is in keeping with that expected for a brain of this size. The ratio of neocortical gray matter volume to corpus callosum crosssectional area is similar in the elephant and human brains (108 and 93.7, respectively), emphasizing the difference between terrestrial mammals and cetaceans, which have a very small corpus callosum relative to the volume of neocortical gray matter (ratio of 181-287 in our sample). Finally, the elephant has an unusually large and convoluted hippocampus compared to primates and especially to cetaceans. This may be related to the extremely long social and chemical memory of elephants. (c) 2005 Wiley-Liss, Inc.