. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NEURAL CONTROL OF METAMORPHOSIS 179. FIGURE 1 a. Competent larva of Dendraster excentricm prepared for glyoxilic acid induced fluo- rescence of catecholamines. Bar = 100 ^m. b. Detail of a region of ciliary band between post-oral and posterodorsal arms of competent larva. Bar = 10 nm. c. Portion of pre-oral transverse ciliary band. Bar = 10 ^m. d. Apical neuropile of competent larva, dark regions are pigment cells that overlie the neuropile. Bar = 10 e. Detail of the oral ganglion. Bar == 10 ^m. f. Tip of post-oral arm
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NEURAL CONTROL OF METAMORPHOSIS 179. FIGURE 1 a. Competent larva of Dendraster excentricm prepared for glyoxilic acid induced fluo- rescence of catecholamines. Bar = 100 ^m. b. Detail of a region of ciliary band between post-oral and posterodorsal arms of competent larva. Bar = 10 nm. c. Portion of pre-oral transverse ciliary band. Bar = 10 ^m. d. Apical neuropile of competent larva, dark regions are pigment cells that overlie the neuropile. Bar = 10 e. Detail of the oral ganglion. Bar == 10 ^m. f. Tip of post-oral arm. Bar == 10 a plexus of axons and verrucosities similar to the axonal tract of the oral ganglion described above (Fig. 3). It is up to 20 ^m thick and is covered by a 10 jum thick epithelium. Electrical stimulation Direct electrical stimulation induced immediate metamorphosis when a suction electrode was attached to either the oral ganglion or the apical neuropile (Table I, Fig. 4). Metamorphosis could also be induced when the electrode was attached to the oral surface of the adult rudiment or the ciliary band on the dorsal surface between the posterodorsal arms, but these locations were successful in less than half of the preparations attempted, and mean thresholds were higher than those needed for the oral ganglion or the preoral plexus. Stimulation with the electrode attached to the epidermis at the posterior end never induced Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
