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Inferior frontal gyrus

Brain: Inferior frontal gyrus
Inferior frontal gyrus of the human brain.
Lateral surface of left cerebral hemisphere, viewed from the side.
Latin gyrus frontalis inferior
Gray's subject #189 822
Part of Frontal lobe
Components Pars opercularis, Pars triangularis, Pars orbitalis
Artery Middle cerebral
NeuroNames hier-67

The inferior frontal gyrus is a gyrus of the frontal lobe of the human brain. Its superior border is the inferior frontal sulcus, its inferior border the lateral fissure, and its posterior border is the inferior precentral sulcus. Above it is the middle frontal gyrus, behind it the precentral gyrus.

The inferior frontal gyrus can be subdivided into the following macroanatomical structures:

  • 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).

Additional images

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Inferior_frontal_gyrus". A list of authors is available in Wikipedia.
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