Faussone-Pellegrini M S, Pantalone D, Cortesini C
Dipartimento di Anatomia Umana e Istologia, Università di Firenze, Policlinico di Careggi, Italia.
J Submicrosc Cytol Pathol. 1989 Jul;21(3):421-37.
The circular muscle layer of the human stomach was studied with the electron microscope. The smooth muscle cells differ structurally according to their location. In fact, the circular muscle layer of the fundus is made up of large, irregularly shaped smooth muscle cells, with long, thick, dense bands, and immersed in an abundant, elastic supporting connective tissue. In the circular muscle layer of the corpus (the two curvatures and the corpus between), those located in the outermost zone are identical to that commonly described in the alimentary tract, but are gradually substituted, first by larger irregularly shaped cells, and then, towards the innermost area, by flattened cells richer in sarcoplasmic reticulum, with thick and continuous dense bands on their submucosal surface. The smooth muscle cells of the antrum are all identical to the outermost located corporal ones. The gap junctions are absent in the fundus and in the innermost area of the corporal circular muscle layer, are present in the other areas, particularly frequent in the antrum and in the outermost area of the greater curvature. The number of the nerve endings is similar in the fundus, greater curvature and antrum, while it is two-three times more in the other parts of the corpus. They are located at the periphery of the muscle bundles in the fundus, antrum and greater curvature, sparsely scattered among the smooth muscle cells in the other areas of the corpus and contain small agranular and large granular synaptic vesicles, often mixed in the same axon. These nerve endings lie distant from the smooth muscle cells in the fundus, antrum and greater curvature and directly contact the smooth muscle cells in the other parts of the corpus.
对人胃的环形肌层进行了电子显微镜研究。平滑肌细胞根据其位置在结构上有所不同。事实上，胃底的环形肌层由大的、形状不规则的平滑肌细胞组成，有长而厚的致密带，并浸浴在丰富的弹性支持结缔组织中。在胃体的环形肌层（两个弯曲部以及其间的胃体），位于最外层区域的细胞与消化道中通常描述的细胞相同，但逐渐被替代，首先被较大的不规则形状的细胞替代，然后，朝着最内层区域，被富含肌浆网的扁平细胞替代，在其黏膜下层表面有厚而连续的致密带。胃窦的平滑肌细胞都与胃体最外层的细胞相同。缝隙连接在胃底和胃体环形肌层的最内层区域不存在，在其他区域存在，在胃窦和大弯的最外层区域尤其常见。神经末梢的数量在胃底、大弯和胃窦中相似，而在胃体的其他部分则多两到三倍。它们位于胃底、胃窦和大弯处肌束的周边，在胃体其他区域的平滑肌细胞中稀疏分布，包含小的无颗粒和大的有颗粒突触小泡，常常在同一轴突中混合存在。这些神经末梢在胃底、胃窦和大弯处与平滑肌细胞相距较远，而在胃体的其他部分则直接与平滑肌细胞接触。
