Blight A R, McGinnis M E, Borgens R B
Center for Paralysis Research, School of Veterinary Medicine, Purdue University, West Lafayette, Indiana 47907.
J Comp Neurol. 1990 Jun 22;296(4):614-33. doi: 10.1002/cne.902960408.
The cutaneus trunci muscle reflex in guinea pigs was studied with a combination of video analysis, electromyography, lesioning, and light microscopy. The muscle forms a bilateral, subdermal sheet over much of the trunk. Local contractions of the dorsal part of the muscle are produced in response to brief tactile or electrical stimulation of the skin and consist of a twitch centered 1-2 cm rostral of the stimulus site. The reflex receptive field covers most of the thoracic and lumbar dorsal surface. The sensory information is carried via segmental dorsal cutaneous nerves. Receptive fields of adjacent nerves overlap and form rectangular areas perpendicular to the midline, at thoracic levels. Motor innervation projects through the lateral thoracic nerves of the brachial plexus. The motoneurons are located near the cervical thoracic junction (C7-T1). Lesions of the lower thoracic cord indicate that ascending sensory information is carried to the motor nuclei via the ventral half of the lateral funiculus. This pathway conveys information primarily from ipsilateral skin. There is a weaker input from contralateral skin, crossing at segmental levels. Electromyographic responses to brief electrical stimulation of lower thoracic skin occur usually as 10-12 msec bursts at latencies of 10-20 msec, and do not readily habituate or fatigue at stimulus frequencies below 10 Hz. The reflex persists under light pentobarbital anesthesia. This combination of characteristics makes the reflex useful for a variety of physiological and pathophysiological studies.
采用视频分析、肌电图、损伤及光学显微镜检查相结合的方法，对豚鼠的躯干皮肌反射进行了研究。该肌肉在躯干的大部分区域形成双侧皮下薄片。对皮肤进行短暂的触觉或电刺激会引起肌肉背部的局部收缩，收缩表现为以刺激部位前方1 - 2厘米为中心的一次抽搐。反射感受野覆盖了大部分胸背部和腰背部表面。感觉信息通过节段性背侧皮神经传导。相邻神经的感受野相互重叠，在胸部水平形成垂直于中线的矩形区域。运动神经支配通过臂丛神经的胸外侧神经投射。运动神经元位于颈胸交界处（C7 - T1）附近。胸段脊髓下部的损伤表明，上行感觉信息通过外侧索腹侧半传导至运动核。这条通路主要传递来自同侧皮肤的信息。对侧皮肤也有较弱的输入，在节段水平交叉。对胸段下部皮肤进行短暂电刺激时，肌电图反应通常在10 - 20毫秒的潜伏期出现10 - 12毫秒的爆发，并且在低于10赫兹的刺激频率下不容易产生习惯化或疲劳。在轻度戊巴比妥麻醉下，该反射仍然存在。这些特征的组合使得该反射可用于各种生理和病理生理学研究。
