| retinal ganglion cell type II | Perry (Perry) | Type II cells have intermediate cell bodies and usually have smaller dendritic fields thant either type I and type III cells (see table 1). The number of primary dendrites varies from 1 to 4 in number and these pass into the outer layers of the inner plexiform layers. The cells have many short branches along the primary dendrites and the dendrites may be spiny (plate 2, figures 4, 5 and 6; and figure 9). | is included | | RGB2 and RGB3 cells strongly resemble the cells described by Perry (1979) as Type II. | Huxlin K.R & Goodchild A.K. | Mihail Bota |
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| retinal ganglion cell Class IIa | Dreher (Dreher) | RGC2 gave a morphology similar to the delta ganglion cells of Peichl (1989). They have a small to medium-sized somata from which fine axons emerge. Two to four primary dendrites branch close to the soma. These and subsequent branches twist and turn, unlike the radiating dendrites of the Group RGA neurons. The soma is usually central to the dendritic field. The dendritic fileds are smalled than those Group RGA cells at the same eccentricities, and they show little variation in size as a function of eccentricity (Fig. 12). RGC2 neurons did not exhibit tracer coupling, but many have numerous and prominent dendritic spines. RGC2 neurons stratify in the outer...laminae of the IPL. Their stratification range, however, is relatively broad, averaging 33% of the IPL (Table 1). | is included | | Dreher and colleagues (1985) identified two types of small-field ganglion cells. It is difficult to determine, as a result of incomplete filling, which of their classes resemble ours. The authors described their Class IIa as ‘‘bushy,’’ which may correlate with our RGB2 cells. Collator note: see also Dreher et al. 1985, and their discussion about the similarity of Class IIa with Type II retinal ganglion cells of Perry, and compare with Table 1 from Huxlin & Goodchild, 1997. | Huxlin K.R & Goodchild A.K. | Mihail Bota |
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