Nakata A, Jozaki A, Hirata N, Tokuriki M
Department of Veterinary Medicine, Faculty of Agriculture, Yamaguchi University, Japan.
J Vet Med Sci. 1994 Jun;56(3):503-9. doi: 10.1292/jvms.56.503.
Segmental synaptic responses in the obliquus externus abdominis (OEA) for stimulation of the dorsal cutaneous and cutaneous-muscle (CD) nerve and the ventral cutaneous and cutaneous-muscle (CV) nerve were investigated in 49 spinal cats and 28 cats under alpha-chloralose anesthesia (chloralose cats) with an intracellular recording method. The result that there was no monosynaptic PSP in OEA motoneurons for stimulation of the CD or CV nerves (containing the cutaneous-muscle nerve) indicates that the cutaneous muscle of the dorsal or ventral area does not connect monosynaptically to the OEA motoneuron. The OEA motoneurons in chloralose cats received few effects from descending pathways coming from the upper spinal cord and the brain. Almost all OEA neurons had polysynaptic EPSP responses for stimulation of the ipsilateral or contralateral CD or CV nerves at 5-10T stimulus intensity in spinal or chloralose cats, which indicates that the OEA muscle can contract bilaterally when strong impulses of superficial afferents from the left or right skin or cutaneous muscle enter in the spinal cord.
采用细胞内记录方法，在49只脊髓猫和28只α-氯醛糖麻醉猫（氯醛糖猫）中，研究了腹外斜肌（OEA）对刺激背侧皮神经和皮肌（CD）神经以及腹侧皮神经和皮肌（CV）神经的节段性突触反应。刺激CD或CV神经（含皮肌神经）时，OEA运动神经元未出现单突触PSP，这一结果表明背侧或腹侧区域的皮肌与OEA运动神经元不存在单突触联系。氯醛糖猫的OEA运动神经元很少受到来自脊髓上部和脑的下行通路的影响。在脊髓猫或氯醛糖猫中，几乎所有OEA神经元在5-10T刺激强度下，对同侧或对侧CD或CV神经刺激都有多个突触的兴奋性突触后电位（EPSP）反应，这表明当来自左侧或右侧皮肤或皮肌的浅表传入强冲动进入脊髓时，OEA肌肉可双侧收缩。
