Inferior frontal gyrus

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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:

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).

Lateral surface of left cerebral hemisphere, viewed from above.

Coronal section through anterior cornua of lateral ventricles.

Drawing to illustrate the relations of the brain to the skull.
v • d • e
Brain: telencephalon (cerebrum, cerebral cortex, cerebral hemispheres)
primary sulci/fissures medial longitudinal, lateral, central, parietoöccipital, calcarine, cingulate
frontal lobe precentral gyrus (primary motor cortex, 4), precentral sulcus, superior frontal gyrus (6, 8), middle frontal gyrus (46), inferior frontal gyrus (Broca's area, 44-pars opercularis, 45-pars triangularis), prefrontal cortex (orbitofrontal cortex, 9, 10, 11, 12, 47)
parietal lobe postcentral sulcus, postcentral gyrus (1, 2, 3, 43), superior parietal lobule (5), inferior parietal lobule (39-angular gyrus, 40), precuneus (7), intraparietal sulcus
occipital lobe primary visual cortex (17), cuneus, lingual gyrus, 18, 19 (18 and 19 span whole lobe)
temporal lobe transverse temporal gyrus (41-42-primary auditory cortex), superior temporal gyrus (38, 22-Wernicke's area), middle temporal gyrus (21), inferior temporal gyrus (20), fusiform gyrus (36, 37)
limbic lobe/fornicate gyrus cingulate cortex/cingulate gyrus, anterior cingulate (24, 32, 33), posterior cingulate (23, 31),
isthmus (26, 29, 30), parahippocampal gyrus (piriform cortex, 25, 27, 35), entorhinal cortex (28, 34)
subcortical/insular cortex rhinencephalon, olfactory bulb, olfactory tract, corpus callosum (splenium, genu, rostrum), lateral ventricles, septum pellucidum, ependyma, internal capsule, corona radiata, external capsule, fornix (commissure of fornix), anterior commissure, posterior commissure
hippocampal formation dentate gyrus, hippocampus, subiculum
basal ganglia striatum (caudate nucleus, putamen), lentiform nucleus (putamen, globus pallidus), claustrum, extreme capsule, amygdala, nucleus accumbens
Some categorizations are approximations, and some Brodmann areas span gyri.
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