Portillo F, Pásaro R
Department of Animal Physiology, Faculty of Biology, Sevilla, Spain.
Brain Behav Evol. 1988;32(4):220-5. doi: 10.1159/000116549.
This paper describes a qualitative and quantitative investigation of the location of the motoneurons innervating the intrinsic laryngeal muscles of rats. Injections of horseradish peroxidase, Diamidino Yellow and True Blue were made either in one or, simultaneously, in three laryngeal muscles. Unlike those in cats and rabbits, the motoneurons that make up the nucleus ambiguus (NA) in rats are not arranged in two separate subgroups, that is one belonging to the cricothyroid (CT) motoneurons and the other to the rest of the intrinsic laryngeal motoneurons. Instead, a superimposition of CT and posterior cricoarytenoid (PCA) motoneurons was observed in the rostral third of the NA. Motoneurons innervating the PCA, thyroarytenoid (TA) and lateral cricoarytenoid (LCA) muscle overlap in the medial third of the NA. Finally, in the region of the NA caudal to the obex, the TA and LCA motoneurons also overlap. Labeled motoneurons were located in the ipsilateral side to the injected muscle in all cases.
本文描述了对支配大鼠喉内肌的运动神经元位置进行的定性和定量研究。将辣根过氧化物酶、双脒基黄和真蓝分别注射到一块或同时注射到三块喉肌中。与猫和兔不同，构成大鼠疑核（NA）的运动神经元并非排列成两个独立的亚组，即一个属于环甲肌（CT）运动神经元，另一个属于其余喉内运动神经元。相反，在疑核的前三分之一区域观察到环甲肌和后环杓肌（PCA）运动神经元相互重叠。支配后环杓肌、甲杓肌（TA）和侧环杓肌（LCA）的运动神经元在疑核的中间三分之一区域重叠。最后，在闩尾侧的疑核区域，甲杓肌和侧环杓肌运动神经元也相互重叠。在所有情况下，标记的运动神经元都位于注射肌肉的同侧。
