inferior occipital gyrus

inferior occipital gyrus (IOG)

The term inferior occipital gyrus (IOG) refers to the most ventral of the human occipital gyri (OGY) defined on the basis of topology ( Duvernoy-1992 ). It is listed in the human glossaries of Mai-1997 and of Talairach-1988, where it is annotated: "the exact identification... is often difficult." Neither author labels it in atlas illustrations of the human occipital lobe (OLB). In the macaque it is defined as the portion of the OLB bounded laterally by the inferior occipital sulcus, medially by the occipitotemporal sulcus and posteriorly by the inferior calcarine fissure ( Martin-2000 ). It has no topological equivalent in the smooth cerebral cortex of the rat or mouse ( NeuroNames-2012 ).

Also known as: inferior occipital gyrus, Gyrus occipitalis inferior, Gyrus occipitalis tertius

NeuroNames ID: 156

All Names & Sources

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English

inferior occipital gyrus

Krieg-1975

Illustrations

Showing 3 illustration(s)

labeled line drawings of
sagittal section in
Macaca fascicularis

multiple views of
3D reconstruction in
Macaca mulatta

drawing of
all aspects in
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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Basis

Has Equivalent

Organism

Their Name

Source

Topology

Yes

Homo sapiens (human)

Gyrus occipitalis inferior

Talairach-1988

Topology

Yes

Homo sapiens (human)

Gyrus occipitalis tertius

Mai-1997

Topology

Yes

Macaca mulatta (Macaca mulatta)

inferior occipital gyrus

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)