orbital gyri - BrainInfo

orbital gyri (ORG)

The term orbital gyri (ORG) refers to a set of convolutions on the ventral surface of the frontal lobe (FLB) in primates. It is defined by topology ( Nomina-1983 ). In the human it consists of five gyri: the medial orbital gyrus (ORGm), the anterior orbital gyrus (ORGa), the posterior orbital gyrus (ORGp), the lateral orbital gyrus (ORGl), and the frontomarginal gyrus (ORGfm) ( Mai-1997 ). The macaque has the same, except that it lacks the ORGfm ( Martin-2000 ). Final 21 Jan 2025.

Also known as: orbitofrontal cortex, Cortex orbitofrontalis, Gyrus orbitalis, gyrus orbitalis longitudinalis, orbital gyri, Gyri orbitales, orbitofrontal gyri, orbitofrontal gyrus, orbital cortex, orbital area, orbitofrontal region

NeuroNames ID: 91

All Names & Sources

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English

orbital area

Crosby-1962

English

orbital cortex

Crosby-1962

English

orbital gyri

Roberts-1970

English

orbitofrontal cortex

Mesulam-1985

English

orbitofrontal gyri

Mai-1997

English

orbitofrontal gyrus

Mai-1997

English

orbitofrontal region

Mesulam-1985

Illustrations

Showing 2 illustration(s)

labeled line drawings of
sagittal section in
Macaca fascicularis

multiple views of
3D reconstruction in
Macaca mulatta

Species With The Structure

Equivalent By	Human	Macaque	Rat	Mouse
Topology	Has The Structure	Relevant Data Not Located	Relevant Data Not Located	Relevant Data Not Located

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Basis

Has Equivalent

Organism

Their Name

Source

Topology

Yes

Homo sapiens (human)

Cortex orbitofrontalis

Schiebler-1999

Topology

Yes

Homo sapiens (human)

Gyri orbitales

Roberts-1970

Topology

Yes

Homo sapiens (human)

orbital area

Crosby-1962

Topology

Yes

Homo sapiens (human)

orbital cortex

Crosby-1962

Topology

Yes

Homo sapiens (human)

orbital gyri

Roberts-1970

Topology

Yes

Homo sapiens (human)

orbitofrontal gyri

Mai-1997

Models Where It Appears

Structural CNS Model - Macaque

Brain structures of the macaque are illustrated in BrainInfo’s NeuroMaps macaque brain atlas. Structures are grouped by proximity in a hierarchy corresponding to the central nervous system hierarchy of NeuroNames ( Bowden-1995 Martin-2000 ). Structures in the NeuroMaps atlas are based on the segmentation of an MRI of the brain of a 3-year old male rhesus macaque (Macaca mulatta). The atlas is most useful for targeting structures for implantating electrodes and chemtrodes. Updated 29 Oct 2025.

brain

forebrain

cerebrum (endbrain)

cerebral cortex (cortical plate)