The Organization of the Primate Insular Cortex.
Level 5 - mechanism / opinion, no new human data
Narrative review synthesizing non-human primate neuroanatomical and functional literature.
PubMed 31133822 · doi:10.3389/fnana.2019.00043
What was done
The authors synthesized neuroanatomical and functional findings, predominantly derived from macaque monkey research, to construct a structural and functional model of the primate insular cortex.
What was found
The abstract reports no quantitative metrics or sample sizes. It presents a tripartite anatomical framework: bodily interoceptive afferents enter the granular dorsal fundus (primary interoceptive cortex), pass through polymodal dysgranular intermediate stripes, and converge in anterior agranular areas. These agranular regions host specialized von Economo and fork neurons and function as an efferent autonomic regulation hub supporting subjective awareness.
Why it matters
This framework outlines how visceral and bodily states are systematically mapped and integrated into emotional and cognitive processing in primates.
Limits
The paper presents a conceptual working model based largely on macaque neuroanatomy, which may not directly translate to human insular architecture. No quantitative meta-analytic data, formal study selection criteria, or sample sizes are reported in the abstract.
Cited by
- supports The insular cortex receives sensory and interoceptive input from internal organs throughout the body, including the heart, liver, and kidneys.