Singla C L
Cell Tissue Res. 1978 Oct 6;193(1):163-74. doi: 10.1007/BF00221609.
Polyorchis penicillatus exhibits outer, inner and endodermal nerve rings. The inner ring contains a number of giant axons with infolded plasma membranes and annular gap junctions. The existence of an innervation supplying the velar radial muscle strengthens the view that the steering mechanism is under nervous control. The basal portions of the cells of the endoderm canals form a muscle band which might enable the animal to regulate the flow of materials or could perform peristalsis.
多聚海葵呈现出外层、内层和内胚层神经环。内层环包含许多具有内褶质膜和环状间隙连接的巨大轴突。为缘膜放射状肌肉提供神经支配的存在强化了这样一种观点，即转向机制受神经控制。内胚层管道细胞的基部形成一条肌带，这可能使动物能够调节物质流动或进行蠕动。
