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Insular projections to the parahippocampal region in the rat.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Mathiasen, Mathias L. Hansen, Lilliane Witter, Menno P.
Description	Country affiliation: Norway Author Affiliation: Mathiasen ML ( Kavli Institute for Systems Neuroscience & Centre for Neural Computation, Norwegian University of Science and Technology (NTNU), Trondheim, Norway.)
Abstract	The insular cortex is involved in the perception of interoceptive signals, coding of emotional and affective states, and processing information from gustatory, olfactory, auditory, somatosensory, and nociceptive modalities. This information represents an important component of episodic memory, mediated by the parahippocampal-hippocampal region. A comprehensive description of insular projections to the latter region is lacking. Previous studies reported that insular projections do not target any of the subdivisions in the hippocampal formation (the dentate gyus, the cornu ammonis [CA] fields 1, 2, and 3 and the subiculum), but, in contrast, target the parahippocampal region (perirhinal, postrhinal, lateral and medial entorhinal cortices, and pre- and parasubiculum). The present study examined the topographical and laminar organization of insular projections to the parahippocampal region in the rat with the use of anterograde tracing. Notably, our results corroborated the absence of hippocampal projections. We further showed that the perirhinal and the lateral entorhinal cortices received extensive projections from the insular cortex, primarily from its agranular areas. With the exception of a weak projection to the postrhinal cortex, projections to the remaining parahippocampal areas were either absent or very sparse. The projections to the lateral entorhinal cortex displayed a preference for the deep layers of its most lateral subdivisions, known also to receive hippocampal inputs. Projections to the perirhinal cortex primarily targeted the superficial layers with a preference for its ventral subdivision, referred to as area 35. Our findings indicate that only processed information, reflecting emotional and affective states, but not primary gustatory and viscerosensory information, has direct access to the parahippocampal-hippocampal system.
File Format	HTM / HTML
ISSN	00219967
Issue Number	9
Volume Number	523
e-ISSN	10969861
Journal	Journal of Comparative Neurology
Language	English
Publisher	Wiley
Publisher Date	2015-06-15
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Neurology Cerebral Cortex Anatomy & Histology Parahippocampal Gyrus Animals Biotin Analogs & Derivatives Dextrans Entorhinal Cortex Female Neural Pathways Neuroanatomical Tract-tracing Techniques Neuronal Tract-tracers Photomicrography Phytohemagglutinins Rats, Sprague-dawley Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Neuroscience

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