external calcarine sulcus

external calcarine sulcus (ecs)

The term external calcarine sulcus refers to a short horizontal groove on the lateral surface of the cerebral cortex near the occipital pole of the occipital lobe. It is found in the human ( Duvernoy-1992 ) and the macaque ( Martin-2000; Paxinos-2009a ). No equivalent structure is found in the rat or the mouse ( NeuroNames ).

Also known as: external calcarine sulcus, Sulcus ectocalcarinus, external calcarine fissure, ectocalcarine sulcus, occipitopolar sulcus

NeuroNames ID: 146

All Names & Sources

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English

ectocalcarine sulcus

Bonin-1947

English

external calcarine fissure

Cunningham-1892

English

external calcarine fissure

Cunningham-1892

English

external calcarine sulcus

Bonin-1947

English

occipitopolar sulcus

NeuroNames

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	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)

occipitopolar sulcus

Duvernoy-1992

Topology

Yes

Macaca mulatta (Macaca mulatta)

external calcarine fissure

Cunningham-1892

Topology

Yes

Macaca mulatta (Macaca mulatta)

external calcarine sulcus

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)