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Vol. 50, No. 2, 1997
Issue release date: 1997
Section title: Original Paper
Brain Behav Evol 1997;50:61–73
(DOI:10.1159/000113323)

Evolution of Nerve Development in Frogs; pp. 61–73

I. The Development of the Peripheral Nervous System in Discoglossus pictus (Discoglossidae)

Schlosser G. · Roth G.
Brain Research Institute, Center for Cognitive Sciences, University of Bremen, Bremen, Germany

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Published online: 1/9/2008
Issue release date: 1997

Number of Print Pages: 13
Number of Figures: 0
Number of Tables: 0

ISSN: 0006-8977 (Print)
eISSN: 1421-9743 (Online)

For additional information: http://www.karger.com/BBE

Abstract

The gross anatomical development of the peripheral nervous system (PNS) during embryogenesis and metamorphosis in the frog Discoglossus pictus is described based on whole-mount immunostaining for nerves and muscles. In the head, neurite outgrowth starts with the mandibular ramus of the trigeminal nerve at the tailbud stage. Cranial muscles are innervated as soon as they differentiate, beginning at mid-embryonic stages. During late embryonic stages, the course of the trigeminal and facial nerves becomes greatly distorted and changes again drastically during metamorphosis accompanying the reorganization of the jaw muscles. Two occipital somites and nerves develop transitorily but degenerate at late embryonic stages. The hypoglossal nerve develops by fusion of the first and second spinal nerves and receives a transitory contribution of the third and fourth spinal nerve at embryonic stages. In the trunk, several classes of Rohon-Beard neurites could be identified at embryonic stages, one of which forms intersegmental sensory nerves that prefigure the course of the sensory rami of spinal nerves at later stages. We give detailed schedules of PNS and cranial muscle de-velopment which, in comparison with data on other frog species described in a companion paper, will serve as a basis to evaluate heterochronic shifts during evolution of PNS development in frogs.

© 1997 S. Karger AG, Basel


  

Author Contacts

Dr. Gerhard Schlosser, Department of Neurosciences, 0201, University of California, San Diego, La Jolla, CA 92093–201 (USA)

  

Article Information

Number of Print Pages : 13

  

Publication Details

Brain, Behavior and Evolution

Vol. 50, No. 2, Year 1997 (Cover Date: 1997)

Journal Editor: Wilczynski, W. (Atlanta, Ga.)
ISSN: 0006–8977 (Print), eISSN: 1421–9743 (Online)

For additional information: http://www.karger.com/BBE


Article / Publication Details

First-Page Preview
Abstract of Original Paper

Published online: 1/9/2008
Issue release date: 1997

Number of Print Pages: 13
Number of Figures: 0
Number of Tables: 0

ISSN: 0006-8977 (Print)
eISSN: 1421-9743 (Online)

For additional information: http://www.karger.com/BBE


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