lateral orbital sulcus

lateral orbital sulcus (los)

The term lateral orbital sulcus refers to a superficial feature identified by dissection on the ventral surface of the frontal lobe. In the human it constitutes the lateral leg of the H-shaped orbital sulci. It separates the lateral orbital gyrus from the (more medial) posterior orbital gyrus, which lies caudal to the transverse orbital sulcus. Rostral to the transverse orbital sulcus, it separates the lateral orbital gyrus from the (more lateral) orbital part of the inferior frontal gyrus ( Mai-1997 ). In the macaque it separates the lateral orbital gyrus from the fronto-orbital gyrus ( Martin-2000 ). Equivalent structures are not found in the smooth cerebral cortex of the rat or mouse ( NeuroNames ).

Also known as: Sulcus orbitalis externus, lateral orbital sulcus, Sulcus orbitalis lateralis

NeuroNames ID: 81

All Names & Sources

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Showing 6 synonym(s) - Use arrows to navigate

Showing 6 synonym(s)

Name:

Sulcus orbitalis externus

Language:

Latin

Organism:

Macaca mulatta

Source:

Clarke-1920

Citation:

Part II in Investigation of the Central Nervous System, The Johns Hopkins Hospital Reports (special volume), Baltimore, The Johns Hopkins Press, 1920

Source Title:

Atlas of photographs of frontal sections of the cranium and brain of the rhesus monkey (Macacus Rhesus)

Name:

los

Language:

acronym

Organism:

human

Source:

Mai-1997

Citation:

San Diego: Academic Press, 1997

Source Title:

Atlas of the Human Brain

Name:

lateral orbital sulcus

Language:

English

Organism:

Macaca mulatta

Source:

Krieg-1975

Citation:

Brain Books, Evanston, Illinois, 1975

Source Title:

Interpretive Atlas Of The Monkey's Brain

Name:

Sulcus orbitalis lateralis

Language:

Latin

Organism:

human

Source:

Mai-1997

Citation:

San Diego: Academic Press, 1997

Source Title:

Atlas of the Human Brain

Name:

sillon orbitaire latéral

Language:

French

Organism:

human

Source:

Duvernoy-1992

Citation:

Springer-Verlag, Paris, 1992

Source Title:

Le cerveau humain: Surface, coupes seriees tridimensionnelles et IRM

Name:

lorbs

Language:

acronym

Organism:

Macaca mulatta

Source:

Paxinos-2009a

Citation:

Amsterdam: Elsevier-Academic Press. 2009

Source Title:

The Rhesus Monkey Brain, Second Edition

Illustrations

Showing 5 illustration(s)

labeled line drawings of
sagittal section in
Macaca fascicularis

surface view of
all aspects in
macaque

drawing of
all aspects in
macaque

drawing of
lateral aspect in
macaque

diagrams of medial and
orbital prefrontal cortex in
human and macaque

Species With The Structure

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

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Showing 5 record(s) - Use arrows to navigate

Showing 5 record(s)

Basis:

Topology

Has Equivalent:

Yes

Organism:

Homo sapiens (human)

Their Name:

Sulcus orbitalis lateralis

Source:

Mai-1997

Basis:

Topology

Has Equivalent:

Yes

Organism:

Macaca mulatta (Macaca mulatta)

Their Name:

lateral orbital sulcus

Source:

Krieg-1975

Basis:

Topology

Has Equivalent:

Yes

Organism:

Macaca mulatta (Macaca mulatta)

Their Name:

Sulcus orbitalis externus

Source:

Clarke-1920

Basis:

Topology

Has Equivalent:

Organism:

Rattus (rat)

Their Name:

---

Source:

NeuroNames

Basis:

Topology

Has Equivalent:

Organism:

Mus (mouse)

Their Name:

---

Source:

NeuroNames

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

endbrain

cerebral cortex (cortical plate)