Fig. 1. Sensory fibers stained by back-filling with cobalt-lysine from the cut end of the medial nerve (MN) and the lateral nerve (LN). (A) Axons running in the MN have their source in the medial flagella (arrowheads in i), and axons running in the LN have their source in the lateral flagella (arrowheads in ii). (B) Typical bipolar cells were stained on the surface of the medial flagella (arrowhead in i) and the lateral flagella (arrowhead in ii). Scale bar, 1 mm (A), 100 µm (B).