Ogden T E, Mascetti G G, Pierantoni R
Invest Ophthalmol Vis Sci. 1985 May;26(5):643-56.
The outer horizontal cell (OHC) of the frog Rana pipiens was studied by light and electron microscopy of Golgi-stained and horseradish peroxidase-injected cells. Responses of OHCs were recorded with intracellular electrodes. The OHCs are probably axonless cells. Their dendritic terminals are lateral processes at synaptic ribbons and are involved frequently in reciprocal invaginating contacts with receptors, ie, contacts characterized by invagination of receptor membrane deeply into the horizontal cell process. Two classes of OHC were distinguished on the basis of size and receptor contacts. Small OHCs (dendritic area about 5,000 micron2) contact all classes of receptor. These cells were not successfully penetrated with microelectrodes. Giant OHCs (dendritic area about 30,000 micron2) apparently contact only blue-sensitive rods and red-sensitive cones. They generate chromaticity or C-type responses, hyperpolarizing to short and depolarizing to long wavelength light.
利用高尔基染色法和辣根过氧化物酶注射细胞的光镜和电镜技术，对牛蛙的外侧水平细胞（OHC）进行了研究。用细胞内电极记录了OHC的反应。OHC可能是无轴突细胞。它们的树突终末是突触带处的侧向突起，经常与感受器形成相互内陷接触，即感受器膜深深内陷到水平细胞突起中的接触。根据大小和感受器接触情况，区分出两类OHC。小OHC（树突面积约5000平方微米）与所有类型的感受器接触。这些细胞未能成功地用微电极穿透。大OHC（树突面积约30000平方微米）显然仅与蓝敏视杆细胞和红敏视锥细胞接触。它们产生色度或C型反应，对短波长光超极化，对长波长光去极化。
