Kumar S
Z Mikrosk Anat Forsch. 1979;93(6):1051-6.
The nerve endings in the heart of fishes were studied using silver impregnation techniques. The heart chambers are profusely innervated by the sympathetic, parasympathetic (vagal) and postganglionic fibers of the intracardiac ganglia situated at the sinuatrial and the atrioventricular junctions. The plexuses are composed of medullated and nonmedullated fibers. The nerve fibers generally end freely and are slightly branched or unbranched terminations of myelinated and unmyelinated fibers. Moreover, a few nerve fibers end redundant in the form of end-rings, bulb-like, bush-like, club-shaped end end-coil like structures. The complex unencapsulated types of endings are also found in the myocardium of the atrium and the ventricle. The encapsulated endings (Vater-Pacinian; Krause end-bulb) could not be observed.
采用银浸染技术对鱼类心脏中的神经末梢进行了研究。心脏腔室由位于窦房结和房室交界处的心内神经节的交感神经、副交感神经（迷走神经）和节后纤维大量支配。神经丛由有髓纤维和无髓纤维组成。神经纤维通常自由终止，是有髓纤维和无髓纤维的轻微分支或无分支的末端。此外，一些神经纤维以端环、球状、灌木状、棒状和端螺旋状结构等形式多余地终止。在心房和心室的心肌中也发现了复杂的无被膜类型的末梢。未观察到被膜末梢（瓦尔特 - 帕西尼小体；克劳斯终球）。
