agranular sector of the insula

agranular sector of the insula (INSag)

The term agranular sector of the insula refers to a portion of the insula defined on the basis of internal structure: it lacks granular cell layers. It is found in the human ( Zilles-2012 ) and the macaque ( Mesulam-1982 ). It is bounded dorsally by the dysgranular insula and laterally by the inferior limiting sulcus. Classified as peripaleocortex, it is located between the piriform cortex ( paleocortex ) and the dysgranular insula ( proisocortex ). It is distinguished from surrounding areas by the absence of the external granular layer (II) and the internal granular layer (IV). It has a superficial layer of pyramidal cells, which is continuous with the pyramidal layer of the piriform cortex, and a deeper layer that is continuous with the claustrum. An intermediate layer of pyramidal cells appears near the boundary with, and continues through, the dysgranular insula. It contains a few granule cells, but they are scattered and do not form clusters or layers as in the other two histologically defined parts of the insula: the dysgranular insula and granular insula. It is the insular component of a three-part agranular area. The others, with which it is continuous, are the agranular orbitofrontal cortex and the medial part of the temporal pole ( Mesulam-1984 ). Note that the agranular sector of the insula is not the same as agranular insular cortex (Roberts), which is illustrated in many textbooks and brain atlases ( Paxinos-2009a ).

Also known as: agranular insula, area Ia-p, agranular-periallocortical belt, Insula, agranular periallocortical, insular periallocortical belt, agranular periallocortex of the insula, agranular-periallocortical cortex, area IPro, agranular domain, agranular sector of the insula

NeuroNames ID: 3316

All Names & Sources

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Name:

agranular insula

Language:

English

Organism:

primate

Source:

Carmichael-1994

Citation:

Source Title:

Architectonic subdivision of the orbital and medial prefrontal cortex in the macaque monkey

Name:

area Ia-p

Language:

English

Organism:

macaque

Source:

Mesulam-1985

Citation:

Chapter 5, pp. 179-226 in Cerebral Cortex, Peters A and Jones EG (Eds), 1985

Source Title:

The insula of Reil in man and monkey: Architectonics, connectivity, and function

Name:

agranular-periallocortical belt

Language:

English

Organism:

macaque

Source:

Mesulam-1985

Citation:

Chapter 5, pp. 179-226 in Cerebral Cortex, Peters A and Jones EG (Eds), 1985

Source Title:

The insula of Reil in man and monkey: Architectonics, connectivity, and function

Name:

Insula, agranular periallocortical

Language:

English

Organism:

macaque

Source:

Mesulam-1982

Citation:

The Journal of Comparative Neurology 212:1-22

Source Title:

Insula of the Old World Monkey. I: Architectonics in the Insulo-orbito-temporal Component of the Paralimbic Brain

Name:

insular periallocortical belt

Language:

English

Organism:

human

Source:

Zilles-2004

Citation:

Chapter 27 in The Human Nervous System, second edition. G. Paxinos and J.K. Mai (Eds.) Amsterdam: Elsevier, 2004.

Source Title:

Architecture of the human cerebral cortex

Name:

agranular periallocortex of the insula

Language:

English

Organism:

human

Source:

Zilles-2004

Citation:

Chapter 27 in The Human Nervous System, second edition. G. Paxinos and J.K. Mai (Eds.) Amsterdam: Elsevier, 2004.

Source Title:

Architecture of the human cerebral cortex

Name:

agranular-periallocortical cortex

Language:

English

Organism:

macaque

Source:

Mesulam-1982

Citation:

The Journal of Comparative Neurology 212:1-22

Source Title:

Insula of the Old World Monkey. I: Architectonics in the Insulo-orbito-temporal Component of the Paralimbic Brain

Name:

area IPro

Language:

English

Organism:

macaque

Source:

Paxinos-2009a

Citation:

Amsterdam: Elsevier-Academic Press. 2009

Source Title:

The Rhesus Monkey Brain, Second Edition

Name:

agranular domain

Language:

English

Organism:

macaque

Source:

Gallay-2012

Citation:

Cerebral Cortex. 22(1): 175-190

Source Title:

The Insula of Reil Revisited: Multiarchitectonic Organization in Macaque Monkeys

Name:

agranular sector of the insula

Language:

English

Organism:

macaque

Source:

Mesulam-1982

Citation:

The Journal of Comparative Neurology 212:1-22

Source Title:

Insula of the Old World Monkey. I: Architectonics in the Insulo-orbito-temporal Component of the Paralimbic Brain

Illustrations

Showing 2 illustration(s)

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
Internal Structure	Has The Structure	Relevant Data Not Located	Relevant Data Not Located	Relevant Data Not Located

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Basis:

Internal Structure

Has Equivalent:

Yes

Organism:

Homo sapiens (human)

Their Name:

insular periallocortical belt

Source:

Zilles-2004

No models found

No models available for this concept.