Kusakabe T, Ishii K, Ishii K
Department of Anatomy, Yokohama City University School of Medicine, Yokohama, 236 Japan.
Laboratoire d' Etude des Régulations Physiologiques, Associé à l' Université Louis Pasteur, C.N.R.S., 67087 Strasbourg, France.
J Morphol. 1988 Aug;197(2):183-191. doi: 10.1002/jmor.1051970205.
Light- and electron-microscopic observations of the chemosensory areas of the arteries of the tortoise (Testudo hermanni) reveal that clusters of nonmuscular cells are found in the adventitial layer of restricted regions of the carotid artery, aortic arch, and pulmonary artery. In these clusters, three types of cells are complexly interwoven: the G-cell closely resembles the glomus cell, which has been found in the arterial chemoreceptor area of several animal species; the LG-cell has very large electron-dense granules; the third type is a G- and LG-cell supporting cell. Membrane specializations are often observed at apposing membranes between G-cells. Two kinds of nerve endings synapse with G-cells, one with numerous clear synaptic vesicles, the other without vesicles. Some G-cells are in membrane-to-membrane contact with smooth-muscle cells (g-s connection), and here a membrane thickening is visible. Nerve terminals with numerous synaptic vesicles synapse with the LG-cells. The G-cell in the carotid artery, the aorta, and the pulmonary artery is a chemoreceptor element ultrastructurally the same as the glomus cell in the arterial chemoreceptor area of various vertebrate species.
对 Hermann 陆龟（Testudo hermanni）动脉化学感受区域的光学显微镜和电子显微镜观察表明，在颈动脉、主动脉弓和肺动脉受限区域的外膜层中发现了非肌细胞簇。在这些细胞簇中，三种类型的细胞复杂地交织在一起：G 细胞与在几种动物物种的动脉化学感受器区域中发现的球旁细胞非常相似；LG 细胞有非常大的电子致密颗粒；第三种类型是 G 细胞和 LG 细胞的支持细胞。在 G 细胞之间相对的膜处经常观察到膜特化。两种神经末梢与 G 细胞形成突触，一种有许多清亮突触小泡，另一种没有小泡。一些 G 细胞与平滑肌细胞有膜对膜接触（g-s 连接），此处可见膜增厚。有许多突触小泡的神经末梢与 LG 细胞形成突触。颈动脉、主动脉和肺动脉中的 G 细胞在超微结构上是一种化学感受器元件，与各种脊椎动物物种动脉化学感受器区域中的球旁细胞相同。
