. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OCTOPUS PHOTORECFPTOR ELECTROPHYSIOLOGY AND INNERVAT1ON 81 with Lucifer yellow, a fluorescent dye (Fig. 3). The dye fills showed that the photoreceptors have a cell soma (50 ) that is located in the wall of the epistellar body and gives rise to a single axon, extending towards the periphery of the epistellar body. The axons from separate photoreceptor cells converge outside the epistellar body to form the 'epistellar' nerve. In addition, a process that may be as long as lOO/um projects towards the center of the epistella
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OCTOPUS PHOTORECFPTOR ELECTROPHYSIOLOGY AND INNERVAT1ON 81 with Lucifer yellow, a fluorescent dye (Fig. 3). The dye fills showed that the photoreceptors have a cell soma (50 ) that is located in the wall of the epistellar body and gives rise to a single axon, extending towards the periphery of the epistellar body. The axons from separate photoreceptor cells converge outside the epistellar body to form the 'epistellar' nerve. In addition, a process that may be as long as lOO/um projects towards the center of the epistellar body, sometimes dividing or branching toward its distal end. No dye coupling between photore- ceptors was observed in any of the cells that were well filled with dye. Figure 4A shows an epistellar body, the attached stel- late ganglion, and the connection of the mantle connective (pallial) nerve to the ganglion. For all cases (n = 8) in which the epistellar body and attached stellate ganglion preparations were filled with fluorescent Di-1 (Fig. 4B, C, D), orthodromic fills indicated that the epistellar body gave off an 'epistellar' nerve (Fig. 4B, C, D) that passed across the stellate ganglion, into the mantle connective (pallial) nerve (Fig. 4B, C), and then, presumably, to the brain. The nerve bundle was more shallow in its path across the stellate ganglion in some preparations (n = 2) than in others. In these preparations, the epistellar nerve remained intact and branched, sometimes into three sepa- rate fiber bundles (Fig. 4B), only before entry to the man- tle connective (pallial) nerve. In addition, these prepara- tions showed a single nerve branch, which occurred close. SO^im Figure 3. lontophoretic microinjection of Lucifer yellow into an epistellar body photoreceptor cell. Detail of photoreceptor cell filled with Lucifer yellow showing cell soma (1) and axon process (2). Note long, branched process (arrows) that extends toward the center of ihc epistellar Plea
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
