Journal ArticleDOI
Organization of the nervous system in the pygmy cuttlefish, Idiosepius paradoxus ortmann (Idiosepiidae, Cephalopoda)
Reads0
Chats0
TLDR
Three‐dimensional images by whole‐mount immunostaining clarified the innervation pattern in the peripheral nervous system in detail and seemed to reflect the inactive nekto‐benthic life of the idiosepiid cuttlefish in the eelgrass bed.Abstract:
The idiosepiid cuttlefish is a suitable organism for behavioral, genetic, and developmental studies. As morphological bases for these studies, organization of the nervous system was examined in Idiosepius paradoxus Ortmann, 1881, using Cajal's silver technique and immunohistochemical staining with anti-acetylated alpha-tubulin antibody. The nervous architecture is generally identical to that described in Sepia and Loligo, but some features characterize the idiosepiid nervous system. The olfactory system is highly developed in the optic tract region. The dorsolateral lobes show large neuropils, connected with each other by a novel well-fasciculated commissure. Each olfactory lobe is subdivided into two lobules. The neuropils of the anterior and the posterior chromatophore lobes are very poorly developed. Neuronal gigantism is not extensive in the brain; enlarged neuronal cells are visible only in the perikaryal layer of the posterior subesophageal mass. The giant nerve fiber system is of the Sepia type; the axons are not markedly thick and the first-order giant fibers do not fuse with each other at the chiasma. Three-dimensional images by whole-mount immunostaining clarified the innervation pattern in the peripheral nervous system in detail. Two commissural fibers link the left and right posterior funnel nerves ventrally and dorsally. The stellate commissure, which is absent in Sepia and Sepiola, connects the stellate ganglia with each other. A branch of the visceral nerve innervating the median pallial adductor muscle is characteristically thick. Tubulinergic reactivity of the cilia and axons reveals the presence of many ciliated cells giving off an axon toward brain nerves in the surface of the funnel, head integument, arm tips, and epidermal lines. Some of these features seem to reflect the inactive nekto-benthic life of the idiosepiid cuttlefish in the eelgrass bed.read more
Citations
More filters
Book
Cephalopods: Ecology and Fisheries
Peter Boyle,Paul G. Rodhouse +1 more
TL;DR: This chapter discusses cephalopods as Predators, Nautilus, and their role in the Biodiversity and Zoogeography of Oceanic and Deep-Sea Species.
Journal ArticleDOI
Invertebrate neurophylogeny: suggested terms and definitions for a neuroanatomical glossary
Stefan Richter,Rudi Loesel,Günter Purschke,Andreas Schmidt-Rhaesa,Gerhard Scholtz,Thomas Stach,Lars Vogt,Andreas Wanninger,Georg Brenneis,Georg Brenneis,Carmen Döring,Simone Faller,Martin Fritsch,Peter Grobe,Carsten Michael Heuer,Sabrina Kaul,Ole Sten Møller,Carsten H. G. Müller,Verena Rieger,Birgen H. Rothe,Martin E.J. Stegner,Steffen Harzsch +21 more
TL;DR: The use of revised neuroanatomical terminology in any new descriptions of the anatomy of invertebrate nervous systems will improve the comparability of this organ system and its substructures between the various taxa, and finally even lead to better and more robust homology hypotheses.
Journal ArticleDOI
Cephalopods in neuroscience: regulations, research and the 3Rs
Graziano Fiorito,Andrea Affuso,David B. Anderson,Jennifer A. Basil,Laure Bonnaud,Laure Bonnaud,Giovanni Botta,Alison G. Cole,Livia D'Angelo,Paolo De Girolamo,Ngaire Dennison,Ludovic Dickel,Anna Di Cosmo,Carlo Di Cristo,Camino Gestal,Rute R. da Fonseca,Frank W. Grasso,Tore S. Kristiansen,Michael J. Kuba,Fulvio Maffucci,Arianna Manciocco,Felix Christopher Mark,Daniela Melillo,Daniel Osorio,Anna Palumbo,Kerry Perkins,Giovanna Ponte,Marcello Raspa,Nadav Shashar,Jane A. Smith,David D. Smith,António V. Sykes,Roger Villanueva,Nathan J. Tublitz,Letizia Zullo,Paul L.R. Andrews +35 more
TL;DR: The approaches being taken by the cephalopod research community to produce “guidelines” are described and the potential contribution of neuroscience research to cepHalopod welfare is described.
Journal ArticleDOI
Cephalopod Ink: Production, Chemistry, Functions and Applications
TL;DR: This review summarizes the current knowledge of cephalopod ink and discusses the chemical components of ink, with a focus on the best known of these—melanin and the biochemical pathways involved in its production.
Journal ArticleDOI
Evolution of the cephalopod head complex by assembly of multiple molluscan body parts: Evidence from Nautilus embryonic development
Shuichi Shigeno,Takenori Sasaki,Takeya Moritaki,Takashi Kasugai,Michael Vecchione,Kiyokazu Agata +5 more
TL;DR: The results demonstrate that the embryonic organs exhibit body plans that are primarily bilateral and antero‐posteriorly elongated at stereotyped positions, and suggest that extensions of the collar‐funnel compartment and free epidermal folds derived from multiple topological foot regions may play an important role in forming the head complex, which is thought to be an important feature during the body plan transition.
References
More filters
Journal ArticleDOI
The development of a simple scaffold of axon tracts in the brain of the embryonic zebrafish, Brachydanio rerio.
TL;DR: At 1 day, the zebrafish brain is impressively simple, with a few small, well-separated tracts but by 2 days the brain is already considerably more complex, supporting the notion that other axons play a crucial role in the guidance of early central nervous system (CNS).
Journal ArticleDOI
Axonogenesis in the brain of zebrafish embryos.
Ajay B. Chitnis,John Y. Kuwada +1 more
TL;DR: The pattern of pathfinding by these growth cones suggests the testable hypothesis that the growth cones of identified clusters of neurons establish the simple set of early tracts by selecting cluster-specific pathways at such intersections in order to reach their targets in the brain.
Journal ArticleDOI
Fused Neurons and Synaptic Contacts in the Giant Nerve Fibres of Cephalopods
TL;DR: The fact that there are two very large nerve cells in the central nervous system of the squid, Loligo, was discovered by Williams (1909), who also gave a brief description of their connexions.