Introduction to Interoception A Homeostatic Afferent Pathway A in addition to C Fibers A in addition to C Fibers in Lamina I Lamina I Projections

Introduction to Interoception A Homeostatic Afferent Pathway A in addition to C Fibers A in addition to C Fibers in Lamina I Lamina I Projections www.phwiki.com

Introduction to Interoception A Homeostatic Afferent Pathway A in addition to C Fibers A in addition to C Fibers in Lamina I Lamina I Projections

Erickson, Jeff, Contributing Writer has reference to this Academic Journal, PHwiki organized this Journal Interoception: the sense of the physiological condition of the body Craig, AD. Current Opinion in Neurobiology. 2003, 13:500-505. Presented by: Yvonne Pao October 24, 2008 Bi 217 Introduction to Interoception Craig, AD 2002 A Homeostatic Afferent Pathway Neural processes that regulate homeostasis require afferent input from the body Parasympathetic: afferents to nucleus of solitary tract (NTS) Sympathetic: A in addition to C fibers to lamina I

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A in addition to C Fibers Purves, et al. 2nd edition A in addition to C Fibers in Lamina I Craig, AD 2003 Lamina I Projections Craig, AD 2002

Lamina I Projections Primates: Lamina I projects to VMpo Thermosensory Insula Activation

Primates: Lamina I projection to MDvc Overall Network of Interoception in Primates Homeostatic Emotions In primates: direct activation of interoceptive cortex in addition to ACC by lamina I Generation of both sensation in addition to motivation Brooks, et al. 2002: activation of interoceptive cortex by noxious heat strong activation of right anterior insula if subject looks at painful stimulus Meta-representation of interoceptive state Incorporation of sensuous (light) touch in interoceptive system

Conclusions Interoceptive system distinct from exteroceptive system (cutaneous mechanoreception in addition to proprioception) Primary interoceptive representation in dorsal posterior insula creates feelings from body including: Pain Hunger Thirst Temperature Direct homeostatic inputs to insula in addition to ACC identify peripheral in addition to central afferent complement to efferent autonomic nervous system Differentiates primates from non-primates “Feeling self” differentiates humans from non-human primates Conclusions in addition to Further Work Endogenous homeostatic control mechanisms modulate the afferent activity that produces feelings from the body Dependence of well-being on the body Opponent processing between parasympathetic in addition to sympathetic afferents may lead to differences between “diffuse” in addition to “distinct” feelings Mutual inhibitory action may be necessary as long as maintaining control of processes in the gut This issue deserves intense study because of potential clinical significance

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