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How Do You Feel?An Interoceptive Moment with Your Neurobiological Self$
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A. D. (Bud) Craig

Print publication date: 2014

Print ISBN-13: 9780691156767

Published to Princeton Scholarship Online: October 2017

DOI: 10.23943/princeton/9780691156767.001.0001

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PRINTED FROM PRINCETON SCHOLARSHIP ONLINE (www.princeton.universitypressscholarship.com). (c) Copyright Princeton University Press, 2022. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in PRSO for personal use.date: 17 May 2022

Interoception and Homeostasis

Interoception and Homeostasis

Lamina I Terminations at Cardiorespiratory Sites in the Brainstem

(p.111) 4 Interoception and Homeostasis
How Do You Feel?

A. D. (Bud) Craig

Princeton University Press

This chapter examines the regions in the brainstem where the ascending lamina I axons terminate. These projection targets are all involved in homeostasis, and thus, these terminations confirm that lamina I projections serve as the central homeostatic pathway that conveys sensory input from the sympathetically innervated tissues of the body. In the lower brainstem or medulla, in fact, lamina I terminations occur precisely in the visceral sensorimotor layer defined by classical neuroanatomists at the junction of the developmental alar and basal plates. Terminations occur in regions that relay homeostatic sensory activity to higher centers as well as in regions that send descending controls to spinal autonomic regions. Homeostatic sensory inputs from parasympathetically innervated tissues that relay in the solitary nucleus also terminate in the same brainstem sites. Comparative evidence indicates that these projections are present in all mammals.

Keywords:   lamina I axons, homeostasis, lamina I projections, homeostatic pathway, lamina I terminations, visceral sensorimotor layer, homeostatic sensory activity, spinal autonomic regions

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