PMID: 11329129May 1, 2001Paper

Embryonic development of the nervous system of the temnocephalid flatworm Craspedella pedum

The Journal of Comparative Neurology
Amelia Younossi-HartensteinV Hartenstein

Abstract

The nervous system of temnocephalid flatworms consists of the brain and three pairs of longitudinal connectives extending into the trunk and tail. The connectives are crosslinked by an invariant number of regularly spaced commissures. Branches of the connectives innervate the tentacles of the head and the sucker organ in the tail. A set of nerve rings encircling the pharynx and connected to the brain and connectives constitute the pharyngeal nervous system. The nervous system is formed during early embryogenesis when the embryo represents a multilayered mesenchymal mass of cells. Gastrulation and the formation of separate epithelial germ layers that characterize most other animal groups are absent. The brain arises as a bilaterally symmetric condensation of postmitotic cells in the deep layers of the anterior region of the embryonic mesenchyme. The pattern of axon outgrowth, visualized by labeling with anti-acetylated tubulin (acTub) antibody, shows marked differences from the pattern observed in other flatworm taxa in regard to the number of neurons that express the acTub epitope. Acetylated tubulin is only expressed in neurons that form long axon tracts. In other flatworm species, such as the typhloplanoid Mesostoma and the p...Continue Reading

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Citations

Sep 1, 2005·Surgical and Radiologic Anatomy : SRA·A Symes, H Ellis
May 7, 2013·Frontiers in Zoology·Uriel KoziolKlaus Brehm
Mar 21, 2012·EvoDevo·José María Martín-Durán, Bernhard Egger
Oct 5, 2007·Zoology : Analysis of Complex Systems, ZACS·Jörn von Döhren, Thomas Bartolomaeus
Jun 29, 2004·BioEssays : News and Reviews in Molecular, Cellular and Developmental Biology·Malcolm K JonesDonald P McManus
May 18, 2011·Glia·Daniel K Hartline
Feb 25, 2015·Developmental Cell·Volker Hartenstein, Angelika Stollewerk
Mar 27, 2003·Cell and Tissue Research·Volker Hartenstein, Malcolm Jones
Aug 8, 2018·Neurogenesis·Maria Del Mar De Miguel-BonetVolker Hartenstein

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