fronto-orbital sulcus

fronto-orbital sulcus (fros)

The term fronto-orbital sulcus refers to a superficial feature of the frontal lobe identified by dissection. Found in about half of human brains, it is a groove located low on the lateral surface of the lobe, where it parallels the ventral surface of the orbital gyri ( Ono-1990 ). In the macaques it is a short sloping groove embedded rostrally in the inferior frontal gyrus at its margin with the orbital gyri ( Martin-2000 ). Some macaques lack a sulcus but have an infraprincipal dimple between the principal sulcus and the lower margin of the frontal lobe at about the same anterior-posterior level. Equivalent structures to not appear in the smooth cerebral cortex of the rat or mouse.

Also known as: fronto-orbital sulcus, Sulcus fronto-orbitalis, orbito-frontal sulcus, Sulcus front-orbitalis

NeuroNames ID: 77

All Names & Sources

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English

fronto-orbital sulcus

Ono-1990

English

fronto-orbital sulcus

Szabo-1984

English

orbito-frontal sulcus

Bonin-1947

Illustrations

Showing 2 illustration(s)

labeled line drawings of
sagittal section in
Macaca fascicularis

drawing of
all aspects in
macaque

Species With The Structure

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

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Basis

Has Equivalent

Organism

Their Name

Source

Topology

Yes

Homo sapiens (human)

fronto-orbital sulcus

Ono-1990

Topology

Yes

Homo sapiens (human)

Sulcus fronto-orbitalis

Topology

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Topology

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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)