inferior calcarine sulcus

inferior calcarine sulcus (clsi)

The term inferior calcarine sulcus (clsi) refers to one of two extensions of the calcarine fissure (clf) where it splits into two short vertically oriented branches near the occipital pole (ocp). This is the ventrally curved inferior branch; the other is a symmetrical, dorsally curved superior calcarine fissure (clss). The branches are found in the macaque ( Martin-2000; Paxinos-2009a ) and, though often not named as separate structures, are illustrated in human brain atlases ( Ono-1990; Duvernoy-1992; Mai-1997 ). No comparable structures are found in the smooth cerebral cortex (CTX) of the rat or mouse ( NeuroNames ). Updated 30 Oct 2024.

Also known as: inferior calcarine sulcus (macaque), Ramus descendens fissurae calcarinae, inferior ramus of calcarine fissure, lower calcarine sulcus, inferior calcarine sulcus

NeuroNames ID: 148

All Names & Sources

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English

inferior calcarine sulcus

NeuroNames

English

inferior calcarine sulcus (macaque)

Martin-1997

English

inferior ramus of calcarine fissure

Bonin-1947

English

lower calcarine sulcus

Krieg-1975

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)

retrocalcarine sulcus

Duvernoy-1992

Page 213

Topology

Yes

Macaca fascicularis (Macaca fascicularis)

inferior calcarine sulcus (macaque)

Martin-1997

Topology

Yes

Macaca mulatta (Macaca mulatta)

inferior ramus of calcarine fissure

Bonin-1947

Topology

Yes

Macaca mulatta (Macaca mulatta)

lower 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)