Orbital part of inferior frontal gyrus

Orbital part of inferior frontal gyrus
Orbital part of inferior frontal gyrus labelled 3.
Lateral surface of cerebral cortex
Details
Identifiers
Latin	pars orbitalis gyri frontalis inferioris
NeuroNames	2410
NeuroLex ID	birnlex_1207
TA98	A14.1.09.114
TA2	5448
FMA	61982
Anatomical terms of neuroanatomy [edit on Wikidata]

The orbital part of inferior frontal gyrus also known as the pars orbitalis is the orbital part of the inferior frontal gyrus.^[1]

In humans, this region is bordered by the triangular part of the inferior frontal gyrus (pars triangularis) and, surrounding the anterior horizontal limb of the lateral sulcus, a portion of the opercular part of inferior frontal gyrus (pars opercularis). Bounded caudally by the anterior ascending limb of the lateral sulcus, it borders on the insula in the depth of the lateral sulcus. It is bordered anteriorly/inferiorly by the lateral orbital sulcus.^[2]^[3]

Cytoarchitectonically it is most closely represented by Brodmann area 47 (BA47).^[4] However, BA47 and pars orbitalis are not synonymous, as pars orbitalis specifically refers to a grossly visible gyral region and BA47 refers to the cytoarchitectonic features of brain tissue. In vivo neuroscience research almost exclusively discusses the gyral region, although the gyral and cytoarchitectonic terms are frequently used synonymously.

Additional images

Lateral view of a human brain showing main gyri labeled.
Animated view of orbital part of inferior frontal gyrus

References

^ "BrainInfo". braininfo.rprc.washington.edu.
^ Keller, S. S., Crow, T., Foundas, A., Amunts, K., & Roberts, N. (2009). Broca’s area: Nomenclature, anatomy, typology and asymmetry. Brain and Language, 109, 29–48. doi:10.1016/j.bandl.2008.11.005
^ Desikan, R. S., Ségonne, F., Fischl, B., Quinn, B. T., Dickerson, B. C., Blacker, D., … Killiany, R. J. (2006). An automated labeling system for subdividing the human cerebral cortex on MRI scans into gyral based regions of interest. NeuroImage, 31(3), 968–980. doi:10.1016/j.neuroimage.2006.01.021
^ Brodmann, K. (1909). Vergleichende Lokalisationslehre der Grosshirnrinde in ihren Prinzipien dargestellt auf Grund des Zellenbaues. Leipzig, Germany: Barth.

External links

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Anatomy of the cerebral cortex of the human brain

Frontal lobe

Superolateral

Prefrontal	Superior frontal gyrus 4 6 8 Middle frontal gyrus 9 10 46 Inferior frontal gyrus: 11 47-Pars orbitalis Broca's area 44-Pars opercularis 45-Pars triangularis Superior frontal sulcus Inferior frontal sulcus
Precentral	Precentral gyrus Precentral sulcus

Medial/inferior

Prefrontal	Superior frontal gyrus 4 6 Medial frontal gyrus 8 9 Paraterminal gyrus/Paraolfactory area 12 Straight gyrus 11 Orbital gyri/Orbitofrontal cortex 10 11 12 Ventromedial prefrontal cortex 10 Subcallosal area 25 Olfactory sulcus Orbital sulcus
Precentral	Paracentral lobule 4 Paracentral sulcus

Both

Parietal lobe

Superolateral	Superior parietal lobule 5 7 Inferior parietal lobule 40-Supramarginal gyrus 39-Angular gyrus Parietal operculum 43 Intraparietal sulcus
Medial/inferior	Paracentral lobule 1 2 3 5 Precuneus 7 Marginal sulcus
Both	Postcentral gyrus/Primary somatosensory cortex 3, 1 and 2 Secondary somatosensory cortex 5 Posterior parietal cortex 7

Occipital lobe

Superolateral	Occipital pole of cerebrum Occipital gyri Lateral occipital gyrus 18 19 Lunate sulcus Transverse occipital sulcus
Medial/inferior	Visual cortex 17 Cuneus Lingual gyrus Calcarine sulcus

Temporal lobe

Superolateral	Transverse temporal gyrus/Auditory cortex 41 and 42 Superior temporal gyrus 38 22/Wernicke's area (Planum temporale) Superior temporal sulcus Middle temporal gyrus 21
Medial/inferior	Occipitotemporal sulcus Fusiform gyrus 37 Medial temporal lobe 27 28 34 35 36 Inferior temporal sulcus Inferior temporal gyrus 20

Interlobar
sulci/fissures

Superolateral	Central (frontal+parietal) Lateral (frontal+parietal+temporal) Parieto-occipital Preoccipital notch
Medial/inferior	Longitudinal fissure Cingulate (frontal+cingulate) Collateral (temporal+occipital) Callosal sulcus

Limbic lobe

Parahippocampal gyrus	anterior Entorhinal cortex Perirhinal cortex Postrhinal cortex Posterior parahippocampal gyrus Prepyriform area
Cingulate cortex/gyrus	Subgenual area 25 Anterior cingulate 24 32 33 Posterior cingulate 23 31 Isthmus of cingulate gyrus: Retrosplenial cortex 26 29 30
Hippocampal formation	Hippocampal sulcus Fimbria of hippocampus Dentate gyrus Rhinal sulcus
Other	Indusium griseum Uncus Amygdala