. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Dorsal View. Ventral View Figure 4. Schematic representations of serotonin-LIR and catechol- amine-containing neurons in Aplysia califomica during day 9. Top row: views from the right side and slightly superior to give a three-dimensional perspective. Anterior is to the right in each figure. (A) Serotonin-LIR cells (S-/1, S-/2. S-/'l, S-i'2, SUMl and fibers in the apical organ. Bottom row: dorsal view. (Bl Cells and fibers containing catecholamines were located in the foot (arrow heads), oral region (arrow), and the region o
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Dorsal View. Ventral View Figure 4. Schematic representations of serotonin-LIR and catechol- amine-containing neurons in Aplysia califomica during day 9. Top row: views from the right side and slightly superior to give a three-dimensional perspective. Anterior is to the right in each figure. (A) Serotonin-LIR cells (S-/1, S-/2. S-/'l, S-i'2, SUMl and fibers in the apical organ. Bottom row: dorsal view. (Bl Cells and fibers containing catecholamines were located in the foot (arrow heads), oral region (arrow), and the region of the future CNS (CC-1, CC-2, CC-3). Bottom row: ventral view. group of foot cells toward the region below the apical tuft where the FMRFamide-LIR apical commissure and seroto- nin-LIR plexus were located. In this region, three cate- cholamine-containing central cells were observed (Fig. 6B); two of these cells (CC-1, CC-2) were located on the right and another cell (CC-3) on the left. Unfortunately, the formaldehyde glutaraldehyde technique resulted in high background fluorescence, making it difficult to determine whether these cells were located in the apical organ or the developing cerebral or pedal ganglia of the future adult CNS. Also by this time, serotonin-LIR fibers could be seen projecting toward the velum, foot, and posterior region (Figs. 4A, 5A). Discussion The current study offers evidence that a relatively exten- sive nervous system forms during embryonic development of the opisthobranch gastropod Aplysiti califomica. The early nervous system includes posterior FMRFamide-LIR cells that first appear during the trochophore stage. By the veliger stage, serotonin-LIR cells appear in the apical organ (Marois and Carew, 1997a, b, c), and shortly before hatch- ing catecholamine-containing cells appear around the mouth and in the foot. The first neurons within the developing. Please note that these images are extracted from scanned page images that may have been digitally
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
