灰被(英文:Indusium griseum),又称胼胝体上回(supracallosal gyrus),是与大脑胼胝体上表面相连的一层灰质薄膜,向外侧延伸至扣带皮层处的灰质[1][2][3]。灰被中线两侧是由纵向纤维形成的脊状结构,即内侧纵纹和外侧纵纹[4]。
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