Orbital part of inferior frontal gyrus

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

Orbital part of inferior frontal gyrus
Orbital part of inferior frontal gyrus labelled 3.
Lateral surface of cerebral cortex
Details
Identifiers
Latinpars orbitalis gyri frontalis inferioris
NeuroNames2410
NeuroLex IDbirnlex_1207
TA98A14.1.09.114
TA25448
FMA61982
Anatomical terms of neuroanatomy

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

See also
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References
  1. "BrainInfo". braininfo.rprc.washington.edu.
  2. 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
  3. 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
  4. Brodmann, K. (1909). Vergleichende Lokalisationslehre der Grosshirnrinde in ihren Prinzipien dargestellt auf Grund des Zellenbaues. Leipzig, Germany: Barth.
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