principal sulcus - BrainInfo

principal sulcus (prs)

The term principal sulcus refers to a superficial feature of the frontal lobe of the macaque. Located on the dorsolateral surface, it is a horizontal groove extending toward the frontal pole from the angle of the arcuate sulcus ( Krieg-1975; Walker-1940 ). The adult human brain has no feature topologically equivalent to it ( Matelli-2004 ). While the human-fetal-brain.htm" TARGET="_BLANK">fetal cortex of the 32-33 week human has such a feature, it is more likely homologous to the inferior frontal sulcus of the adult human ( Savel'ev-2005 ). It is not present in the smooth cerebral cortex of the rat or the mouse ( NeuroNames ).

Also known as: sulcus rectus (Walker), principal sulcus (macaque), Sulcus principalis, rectus sulcus, Sulcus frontalis, inferior frontal sulcus (Walker), Sulcus frontalis principalis

NeuroNames ID: 66

All Names & Sources

1 of 10

Showing 10 synonym(s) - Use arrows or swipe to navigate

Showing 10 synonym(s)

English

inferior frontal sulcus (Walker)

Walker-1940

English

principal sulcus (macaque)

Krieg-1975

English

rectus sulcus

Szabo-1984

Illustrations

Showing 4 illustration(s)

drawing of
all aspects in
human

labeled line drawings of
sagittal section in
Macaca fascicularis

surface view of
all aspects in
macaque

drawing of
all aspects in
macaque

Species With The Structure

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

1 of 3

Showing 3 record(s) - Use arrows to navigate

Showing 3 record(s)

Basis

Has Equivalent

Organism

Their Name

Source

Topology

---

Topology

---

Topology

---

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)