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Here we discuss the role of a particular proprioceptor, the IA muscle spindle proprioceptor in causing movement disorders in response to either regeneration of a sectioned peripheral nerve or damage from neurotoxic chemotherapy. For each condition, there is a single preferred and widely repeated explanation for disability of movements associated with proprioceptive function. We present a mix of published and preliminary findings from our laboratory, largely from<jats:italic>in\u00a0vivo<\/jats:italic>electrophysiological study of treated rats to demonstrate newly discovered IA afferent defects that seem likely to make important contributions to movement disorders. First, we argue that reconnection of regenerated IA afferents with inappropriate targets, although often repeated as the reason for lost stretch\u2013reflex contraction, is not a complete explanation. We present evidence that despite successful recovery of stretch\u2010evoked sensory signaling, peripherally regenerated IA afferents retract synapses made with motoneurons in the spinal cord. Second, we point to evidence that movement disability suffered by human subjects months after discontinuation of oxaliplatin (OX) chemotherapy for some is not accompanied by peripheral neuropathy, which is the acknowledged primary cause of disability. Our studies of OX\u2010treated rats suggest a novel additional explanation in showing the loss of sustained repetitive firing of IA afferents during static muscle stretch. Newly extended investigation reproduces this effect in normal rats with drugs that block Na<jats:sup>+<\/jats:sup>channels apparently involved in encoding static IA afferent firing. Overall, these findings highlight multiplicity in IA afferent deficits that must be taken into account in understanding proprioceptive disability, and that present new avenues and possible advantages for developing effective treatment. Extending the study of IA afferent deficits yielded the additional benefit of elucidating normal processes in IA afferent mechanosensory function.<\/jats:p>","DOI":"10.1111\/joa.12312","type":"journal-article","created":{"date-parts":[[2015,6,5]],"date-time":"2015-06-05T15:09:46Z","timestamp":1433516986000},"page":"221-230","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Complex impairment of IA muscle proprioceptors following traumatic or neurotoxic injury"],"prefix":"10.1111","volume":"227","author":[{"given":"Jacob A.","family":"Vincent","sequence":"first","affiliation":[{"name":"Department of Neuroscience, Cell Biology and Physiology Wright State University Dayton OH USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Paul","family":"Nardelli","sequence":"additional","affiliation":[{"name":"Department of Neuroscience, Cell Biology and Physiology Wright State University Dayton OH USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hanna M.","family":"Gabriel","sequence":"additional","affiliation":[{"name":"Department of Neuroscience, Cell Biology and Physiology Wright State University Dayton OH USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Adam S.","family":"Deardorff","sequence":"additional","affiliation":[{"name":"Department of Neuroscience, Cell Biology and Physiology Wright State University Dayton OH USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Timothy C.","family":"Cope","sequence":"additional","affiliation":[{"name":"Department of Neuroscience, Cell Biology and Physiology Wright State University Dayton OH 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