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CLSM analysis of the phalloidin‐stained muscle system in Nerilla antennata , Nerillidium sp. and Trochonerilla mobilis (Polychaeta; Nerillidae)
Author(s) -
Müller Monika C.M.,
Worsaae Katrine
Publication year - 2006
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.10292
Subject(s) - anatomy , biology , phalloidin , dorsum , confocal laser scanning microscopy , oblique case , biophysics , cytoskeleton , linguistics , philosophy , genetics , cell
The entire muscle system of Nerilla antennata, Nerillidium sp. and Trochonerilla mobilis was three‐dimensionally reconstructed from whole mounts. In juvenile and adult specimens the F‐actin musculature subset was stained with FITC‐conjugated phalloidin and visualized with a confocal laser scanning microscope (cLSM). The muscle system shows the following major organization: 1) circular muscles are totally absent in the body wall; 2) the longitudinal muscles are confined in two ventral and two dorsal thick bundles; 3) additional longitudinal muscles are located in the ventro‐ and dorsomedian axis; 4) three segmental pairs of ventral oblique muscles elongate into the periphery: the main dorsoventral muscles that run along the body side posterior and dorsally and the anterior and posterior oblique parapodial muscles, which contribute to the ventral chaetal sacs; 5) one segmental pair of dorsal oblique parapodial muscles, contributing to the dorsal chaetal sacs; 6) five to seven small dorsoventral muscles per segment; and 7) complex head and pharyngeal musculature. These results support the belief that absence of circular muscles in the polychaete body wall is much more widely distributed than is currently presumed. © 2004 Wiley‐Liss, Inc.