Convergence of nociceptive information from temporomandibular joint and tooth pulp afferents on C1 spinal neurons in the rat.
作者： Toshimi Nishikawa , Mamoru Takeda , Takeshi Tanimoto , Shigeji Matsumoto
DOI: 10.1016/J.LFS.2004.03.014
关键词: Electromyography 、 Digastric muscle 、 Receptive field 、 Spinal cord 、 Medicine 、 Nociceptor 、 Nociception 、 Temporomandibular joint 、 Anatomy 、 Reflex
摘要: The aim of the present study was to test hypothesis that there is a convergence afferent inputs from temporomandibular joint (TMJ) on C1 spinal neurons responding electrical stimulation tooth pulp (TP). In 14 pentobarbital anesthetized rats, extracellular single unit activity 31 and amplitude in digastric muscle electromyogram (n = 31) increased proportionally during 1.0-3.5 times threshold for jaw-opening reflex (JOR). Of responsive TP afferents, 28 (approximately 90%) were also excited by ipsilateral TMJ capsule. All tested divided into three categories nociceptive specific, wide dynamic range non-responsive as their responsiveness mechanical stimuli (pin prick touch) somatic receptive field (skin face, neck, jaw upper forearm) Nineteen (68%) received information C fibers These results suggest noxious afferents same neurons, which importantly contribute pain perception region.
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