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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

v • d • e
Brain: telencephalon (cerebrum, cerebral cortex, cerebral hemispheres)
Primary sulci/fissuresMedial longitudinal, Lateral, Central, Parietoöccipital, Calcarine, Cingulate, Callosal Collateral fissure
Frontal lobePrecentral gyrus (Primary motor cortex, 4), Precentral sulcus, Superior frontal gyrus/Frontal eye fields (6, 8, 9), Middle frontal gyrus (46), Inferior frontal gyrus (44-Pars opercularis, 45-Pars triangularis), Orbitofrontal cortex (10, 11, 12, 47)
Parietal lobeSomatosensory cortex (Primary (1, 2, 3, 43), Secondary (5)), Precuneus (7m), Parietal lobules (Arcuate fasciculus/Superior (7l), Inferior (40)), Angular gyrus (39), Intraparietal sulcus, Marginal sulcus
Occipital lobePrimary visual cortex (17), Cuneus, Lingual gyrus, 18, 19 - Lateral occipital sulcus
Temporal lobePrimary auditory cortex (41, 42), Superior temporal gyrus (38, 22), Middle temporal gyrus (21), Inferior temporal gyrus (20), Fusiform gyrus (37) Medial temporal lobe (Amygdala, Hippocampus, Parahippocampal gyrus (27, 28, 34, 35, 36)
Cingulate cortex/gyrusSubgenual area (25), anterior cingulate (24, 32, 33), Posterior cingulate (23, 31), Retrosplenial cortex (26, 29, 30), Supracallosal gyrus
white matter tractsCorpus callosum (Splenium, Genu, Rostrum, Tapetum), Septum pellucidum, Internal capsule, Corona radiata, External capsule, Olfactory tract, Fornix (Commissure of fornix), Anterior commissure, Posterior commissure Terminal stria Superior and Inferior longitudinal fasciculus, uncinate fasciculus, cingulum, Inferior occipitofrontal fasciculus
Basal gangliaStriatum (Putamen,Caudate nucleus, Nucleus accumbens), Globus pallidus, Claustrum, Subthalamic nucleus, Substantia nigra
OtherInsular cortex Olfactory bulb, Anterior olfactory nucleus Septal nuclei Basal optic nucleus of Meynert
Some categorizations are approximations, and some Brodmann areas span gyri.
 
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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