. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PMC. posterior Ventral Figure 2. Schematic drawings of the cypnd nervous system and major organs in longitudinal and horizontal planes. (A-B) The body of the cyprid is organized in two main compartments, the cephalon and the thorax. The bivalve carapace encloses anterior (AMC) and posterior (PMC) mantle cavities about the cephalon and thorax respectively. The brain, compound eyes (CE), median eye (ME), and cement glands (CG) are contained within the cephalon. The antennules extend from the cephalon and bear the adhesive disc
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PMC. posterior Ventral Figure 2. Schematic drawings of the cypnd nervous system and major organs in longitudinal and horizontal planes. (A-B) The body of the cyprid is organized in two main compartments, the cephalon and the thorax. The bivalve carapace encloses anterior (AMC) and posterior (PMC) mantle cavities about the cephalon and thorax respectively. The brain, compound eyes (CE), median eye (ME), and cement glands (CG) are contained within the cephalon. The antennules extend from the cephalon and bear the adhesive discs and putative chemoreceptive and mechanoreceptive sensilla. The brain connects with the posterior ganglion via circumesophageal connectives (CC). The posterior ganglion and gut are contained within the thorax. Six pairs of thoracic appendages (TA) and a pair of caudal rami (CR) extend from the thorax. (C-D) The orientation of neural structures in the cyprid depends on the relative position of the antennules and thoracic appendages, both of which extend beyond the carapace when the c\pnd either swims or contacts the substratum (C), or can be withdrawn for protection (D). Planes are identified on the basis of the orientation ot the nervous system in (C). Other abbreviations: ASC. antennular soma cluster; OC. oil cell; FF, frontal hlamein. increasing concentrations of Araldite epoxy resin, and Hat- embedded on microscope slides. Flat embedding allowed the orientation of the specimen to be determined using a light microscope. The Araldite was then removed from the slides by cold shock (using liquid nitrogen) and specimens cut from the blocks and remounted on Araldite stubs for sectioning. Lii>!ii microscopy. Twelve animals were serially sec- tioned at cither or /j,m (six in sagittal plane, three frontal, and three horizontal—see Fig. 2 for orientation) with a Reichen-Jung ultramicrotome and diamond histology knife. Sections were transferred to microscope slides and st
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
