In about 85% of JAM-B cells, there exists a marked asymmetry in the dendritic arbor. In these cases, more than 90 percent of the dendritic arbor lies on one side of the soma. Asymmetry of the dendritic arbor is an unusual feature for a retinal ganglion cell because most of the dendrites of retinal ganglion cells are symmetrical. Therefore, the prevalence of this asymmetry in such a high proportion of JAM-B cells is notable. Even more notable is that the asymmetrical dendrites of JAM-B cells all point in the same direction, about 13 degrees nasal of ventral. Relative to the optic nerve head, there exists a longitudinal, rather than radial, dendritic orientation (dorsal to ventral).
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