. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 372 L. R. PAGE. CPC Figure 11. Reconstruction of cephalopedal ganglia and supramtes- tinal ganglion in larva of Mel i he Iconina. right, ventro-lateral view. Gan- glia and connectives labelled on right side only. For clarity, rhinophoral ganglia are omitted and connectives over the statocysts are elongated. Broken lines show initial axon tracts of labial neurons (all tracts do not necessarily arise from single neurons). BG = huccal ganglion; CBC = cerehrobuccal connective: CC = cerebral commissure: CG = cerebral ganglion; CP
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 372 L. R. PAGE. CPC Figure 11. Reconstruction of cephalopedal ganglia and supramtes- tinal ganglion in larva of Mel i he Iconina. right, ventro-lateral view. Gan- glia and connectives labelled on right side only. For clarity, rhinophoral ganglia are omitted and connectives over the statocysts are elongated. Broken lines show initial axon tracts of labial neurons (all tracts do not necessarily arise from single neurons). BG = huccal ganglion; CBC = cerehrobuccal connective: CC = cerebral commissure: CG = cerebral ganglion; CPC = cerebropedal connective: CPLC = cerebropleural con- nective; E = esophagus; EY = eye; LG = labial ganglion; PG = pedal ganglion; PLG = pleural ganglion; ST = statocyst: VL = visceral loop. nerve becomes the nerve labelled Cl in adult Mclibc by Hurst (1968). This nerve innervates the oral tube and lips. Discussion Identifications of ganglia Pedal ittuiglui. The pedal ganglia in Mclibc Iconina, like those in other gastropods, arise from proliferative ec- toderm along ventro-lateral zones of the larval foot. In- gressing pedal neurons are associated with axons that ex- tend from the intraganglionic fiber tract of each cerebro- pedal connective, to the overlying neurogenic ectoderm of the pedal placode. These axon tracts become peripheral nerves after metamorphosis. A similar association between ingressing neurons and peripheral axon tracts was ob- served for pleural and visceral ganglia. In Aplysia californica, the number of neurons within all central ganglia continue to increase after metamor- phosis (Cash and Carew, 1989), and results of McAllister ct ul. (1983) and Hickmott and Carew (1991) suggest that added neurons come from the body wall. Jacob (1984) and McAllister cl ul. (1983) proposed that ingressing neu- rons in larvae and juveniles of this species migrate along connective tissue strands or muscle fibers to reach their definitive locations within the CNS. Alternativ
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
