. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NEURAL CONTROL OF METAMORPHOSIS 181. FIGURE 3 a. Transverse section through apical neuropile of competent larva of Dendraster excen- tricus. Bar = 1 ^m. b. Detail of neuropile showing axonal profiles and varrucosites. Bar = ^m. np, neuropile; v, vesicles. min, and the remainder of metamorphosis proceeded in typical sequence. Juveniles that were induced to metamorphose by electrical stimulation appeared normal and lived indefinitely. When the electrode was attached to the ciliary band on the dorsal surface of the larva b
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NEURAL CONTROL OF METAMORPHOSIS 181. FIGURE 3 a. Transverse section through apical neuropile of competent larva of Dendraster excen- tricus. Bar = 1 ^m. b. Detail of neuropile showing axonal profiles and varrucosites. Bar = ^m. np, neuropile; v, vesicles. min, and the remainder of metamorphosis proceeded in typical sequence. Juveniles that were induced to metamorphose by electrical stimulation appeared normal and lived indefinitely. When the electrode was attached to the ciliary band on the dorsal surface of the larva between the posteriodorsal arms, the oral surface of the adult rudiment, or TABLE I Summary of experiments correlating position oj the electrode with the threshold oj stimuli that will induce immediate metamorphosis of competent larvae of Dendraster excentricus Electrode location Oral ganglion Apical neuropile Posterior end Ciliary band Oral surface of rudiment Number metamorphosed 7/8 7/8 Mean threshold (Volts) ± ± 13.* 0/5 3/7 ± 3/7 ± * Metamorphosis was never induced with electrode located here regardless of the intensity of stim- 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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