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The inferior frontal gyrus is a gyrus of the frontal lobe (the yellow area of the human brain image to the right). It is labelled ''gyrus frontalis inferior'', its Latin name. In the yellow area, its superior border is the inferior frontal sulcus (which divides it from the ''gyrus frontalis medius'' in the yellow area), its inferior border the lateral fissure (which divides it from the ''gyrus temporalis superior'' in the green area), and its posterior border is the inferior precentral sulcus (in the yellow area). Above it is the middle frontal gyrus (the ''gyrus frontalis medius''), behind it the precentral gyrus (the ''gyrus praecentralis''), both gyri in the yellow area of the image.〔 photos on p526 & p.546〕 The inferior frontal gyrus, like the middle frontal gyrus and the superior frontal gyrus, is more of a region than a true gyrus. ==Structure== The inferior frontal gyrus can be subdivided into the following macroanatomical structures, shown in yellow in the top image, just below the label ''gyrus frontalis inferior'': * Pars opercularis (cortex posterior to the ascending ramus of the lateral fissure) * Pars triangularis (cortex between the ascending ramus and the horizontal ramus of the lateral fissure) * Pars orbitalis (cortex inferior and anterior to the horizontal ramus of the lateral fissure) The inferior frontal gyrus includes the following cytoarchitectonic areas: * Brodmann area 44 * Brodmann area 45 * Brodmann area 47 * cytoarchitectonic areas of the deep frontal operculum The cytoarchitectonic areas very roughly correspond to the following macroanatomic structures: Brodmann area 44 to Pars opercularis, Brodmann area 45 to Pars triangularis, and Brodmann area 47 to Pars orbitalis. Brodmann area 44 corresponds to Broca's area (sometimes Broca's area is taken to encompass Brodmann's areas 44 and 45) — for the dominant hemisphere of the brain. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「inferior frontal gyrus」の詳細全文を読む スポンサード リンク
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