The spinal cord appears throughout the depth-psychology corpus not as a mere anatomical landmark but as the foundational relay structure through which bodily states are translated into the psychologically significant signals of feeling, pain, temperature, and homeostatic regulation. Craig's sustained neuroanatomical programme dominates the treatment: the spinal cord's lamina I neurons, dorsal horn architecture, and spinothalamic pathways are shown to be the first central station at which small-diameter interoceptive fibers are sorted from exteroceptive ones, establishing the embryological and functional distinction between visceral and somatic sensation that ultimately grounds subjective feeling in neural reality. Kandel situates the spinal cord more classically, as the seat of reflex behaviour and the upward-extending foundation of the central nervous system, through which sensory inputs are transformed into coordinated motor commands. Fogel engages the spinal cord from the clinical phenomenology of embodied self-awareness, noting that proprioceptive and interoceptive fibers converge in the cord before ascending to common brainstem and cortical targets. Damasio references it architecturally, as the segmental entry point for organismic signals travelling bottom-to-top toward consciousness-generating brain regions. The central tension in the corpus runs between the spinal cord as reflex machine — Sherrington's legacy as transmitted through Kandel — and the spinal cord as the origin point of the interoceptive, homeostatic, and ultimately feeling self, as Craig argues.
In the library
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It projects first to autonomic and homeostatic centres in the spinal cord and brainstem, thereby providing the long-missing afferent complement of the efferent autonomic nervous system.
Craig argues that the lamina I spinothalamocortical system constitutes an interoceptive pathway whose first target is the spinal cord, making the cord the missing afferent anchor of the autonomic nervous system and the foundation of felt homeostasis.
Craig, A. D., How Do You Feel? Interoception: The Sense of the Physiological Condition of the Body, 2002thesis
The development of the spinal cord begins with the closure of the neural tube and the emergence of the alar and basal plates, which extend longitudinally through all of the spinal segments.
Craig traces the embryological architecture of the spinal cord to show that interoceptive and exteroceptive neurons arise from distinct neuroectodermal compartments, grounding the functional distinction in developmental morphology.
Craig, A.D. Bud, How Do You Feel? An Interoceptive Moment with Your Neurobiological Self, 2014thesis
The activity of the motor output neurons of both divisions of the ANS is controlled by oscillations and reflexes that are organized first at the level of the peripheral ganglia and next at the level of the preganglionic sympathetic and parasympathetic cell groups in the spinal cord and brainstem.
Craig establishes the spinal cord as the primary central locus of autonomic motor organisation, where preganglionic sympathetic and parasympathetic neurons are coordinated by chemically differentiated interneuron connections.
Craig, A.D. (Bud), How Do You Feel? An Interoceptive Moment with Your Neurobiological Self, 2015thesis
A knife cut that severed the spinal cord on one side produced a loss of pain and temperature sensations only on the opposite (contralateral) side of the body… combined with the loss of discriminative touch sensation and skeletal motor function on the same (ipsilateral) side.
Craig uses classical clinical lesion evidence to demonstrate that the two ascending somatosensory pathways — spinothalamic and dorsal column — are anatomically and functionally distinct within the spinal cord, a dissociation that drives his interoceptive hypothesis.
Craig, A.D. Bud, How Do You Feel? An Interoceptive Moment with Your Neurobiological Self, 2014thesis
Small, dark B-cells and lamina I neurons provide input to 'visceral' motor cells of the ANS in the lateral horn and the central autonomic nucleus, which drive smooth muscle and subserve homeostasis.
Craig demonstrates that the spinal cord's lamina I and lateral horn form a coherent interoceptive sensorimotor circuit, functionally and embryologically separate from the exteroceptive circuit subserving skeletal locomotion.
Craig, A.D. Bud, How Do You Feel? An Interoceptive Moment with Your Neurobiological Self, 2014thesis
The different types of preganglionic sympathetic neurons show distinct patterns of reflex responses to noxious, thermal, and tactile stimuli, which are specified by chemically differentiable spinal interneuron connections.
Craig shows that spinal interneuron chemistry specifies modality-selective autonomic reflex patterns, giving the cord an active integrative role rather than mere relay function.
Craig, A.D. (Bud), How Do You Feel? An Interoceptive Moment with Your Neurobiological Self, 2015supporting
The hypothalamus sends descending control signals to all of the homeostatic regions in the brainstem, as well as to the spinal cord, where hypothalamic terminations are found exclusively in the autonomic cell columns (IML) and in lamina I.
Craig establishes that hypothalamic descending control reaches the spinal cord exclusively through autonomic and lamina I columns, confirming the cord as a dedicated node in the homeostatic command hierarchy.
Craig, A.D. Bud, How Do You Feel? An Interoceptive Moment with Your Neurobiological Self, 2014supporting
The spinal cord contains the machinery needed for simple reflex behaviors… by examining the spinal cord, one can understand in microcosm the overall purpose of the central nervous system.
Kandel presents the spinal cord as a pedagogical microcosm of CNS function — the site where sensory input is transformed into coordinated motor output — anchoring the classical reflex paradigm.
Kandel, Eric R., In search of memory the emergence of a new science of mind, 2006supporting
Lateral spinothalamic tract HPC… Spinal cord FIGURE 1. The central projection map for homeostatic sensory inputs in the monkey.
Craig's central projection map positions the spinal cord as the origin point of the lateral spinothalamic tract, the principal route by which homeostatic sensory signals ascend toward thalamic and cortical representation.
Craig, A.D. Bud, How Do You Feel? An Interoceptive Moment with Your Neurobiological Self, 2014supporting
The axons from all three groups cross to the contralateral side of the spinal cord at the same spinal level as the cell bodies (the 'segment of origin').
Craig details the segmental decussation rule in the spinal cord that produces the contralateral representation of pain and temperature, a structural fact central to understanding the spinothalamic pathway's organisation.
Craig, A.D. (Bud), How Do You Feel? An Interoceptive Moment with Your Neurobiological Self, 2015supporting
All these interoceptive fibers go to the same place in the spinal cord, from whence they project to a common location in the brain stem, and from there to a common set of brain regions.
Fogel affirms the spinal cord as the shared convergence point of all interoceptive afferent fibers, linking neuroanatomy to the clinical phenomenology of embodied self-awareness.
Fogel, Alan, Body Sense: The Science and Practice of Embodied Self-Awareness, 2009supporting
The nerves from the spinal cord to the proprioceptors for stretch and to the spinal cord from the motor neurons used to activate muscle contractions — compared to the small, slow and unmyelinated interoceptive neurons — are fast, large, and myelinated.
Fogel contrasts the fast proprioceptive pathways of the spinal cord with slow interoceptive fibers, using this distinction to explain the developmental construction of the body schema.
Fogel, Alan, Body Sense: The Science and Practice of Embodied Self-Awareness, 2009supporting
At lower levels in the brain stem and all the way from the bottom of the spinal cord upward, segment by segment, we encounter the entry points for all the other nerves which carry s[ignals of organismic state].
Damasio frames the spinal cord as the segmental, bottom-to-top entryway for the organism's self-signalling, making it an indispensable architectural contributor to the ascending construction of consciousness.
Damasio, Antonio R., The Feeling of What Happens: Body and Emotion in the Making of Consciousness, 1999supporting
These regions are among the major sources of descending noradrenergic and enkephalinergic bulbospinal input to the entire spinal gray matter, as well as ascending input to the ipsilateral forebrain.
Craig identifies a spino-bulbo-spinal feedback loop in which lamina I terminations in pontine noradrenergic nuclei activate descending modulation of the spinal superficial dorsal horn, revealing the cord as a site of bidirectional nociceptive regulation.
Craig, A.D. Bud, How Do You Feel? An Interoceptive Moment with Your Neurobiological Self, 2014supporting
In the case of spinal reflexes, these responses are mediated by the spinal cord and do not require that messages be sent to the brain.
Kandel's glossary defines spinal reflexes as cord-mediated and brain-independent, marking the classical lower limit of central nervous system purposiveness in the reflex tradition.
Kandel, Eric R., In search of memory the emergence of a new science of mind, 2006aside
The central nervous system includes the brain and the spinal cord. Although anatomically distinct, the central and peripheral nervous systems are functionally interconnected.
Kandel's definitional entry situates the spinal cord as one of the two constitutive structures of the central nervous system, emphasising its functional continuity with peripheral neural networks.
Kandel, Eric R., In search of memory the emergence of a new science of mind, 2006aside
c-Fos induction in spinal cord neurons after renal arterial or venous occlusion.
A bibliographic reference in Craig's 2002 paper documents spinal cord neuronal activation in response to visceral vascular occlusion, supporting the cord's role in visceral interoceptive signalling.
Craig, A. D., How Do You Feel? Interoception: The Sense of the Physiological Condition of the Body, 2002aside