Sponsor
Portland State University. Department of Biology
First Advisor
Leonard Simpson
Date of Publication
1977
Document Type
Thesis
Degree Name
Master of Science (M.S.) in Biology
Department
Biology
Language
English
Subjects
Nervous system -- Invertebrates, Neurosecretion, Cerebral ganglion, Reproduction, Amphiphorus imparispinosus
DOI
10.15760/etd.2514
Physical Description
1 online resource (36 p.)
Abstract
Nemerteans are common invertebrates along coastlines in both temperate and arctic climates throughout the world. Amphiphorus imparispinosus is a carnivorous member of this phylum that is found abundantly in the intertidal areas of the Oregon coast. As in many other invertebrate phyla, endocrine integration within the nemerteans is thought to be accomplished by neurosecretory mechanisms. In Amphiphorus the presence of these neurosecretory systems has not been previously shown. This project was undertaken to determine if neurosecretory cells are present within the central nervous system of this species and. further, to examine seasonal changes in the number and appearance of these cells. The second objective of this research was to determine the reproductive cycle of Amphiphorus and to examine a possible correlation between this cycle and seasonal changes in the neurosecretory system.
Rights
In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
Persistent Identifier
http://archives.pdx.edu/ds/psu/16032
Recommended Citation
Jacobson, Gail H., "Localization of neurosecretory cells within the cerebral ganglia of Amphiphorus imparispinosus Griffin, 1898 (Hoplonemertea) and their possible regulatory role in the annual reproductive cycle" (1977). Dissertations and Theses. Paper 2517.
https://doi.org/10.15760/etd.2514