Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: The effect of salinties and calium ion concentration on the muscle and nerve preparations of Cirriformia spirabrancha
Student Author(s): Rohlf, David G.
Faculty Advisor(s): Pearse, J
Pages: 17
Location: Final Papers Biology 175H
Date: June 1968
Keywords: Polychaete worm
Abstract: 1. Three types of body wall preparations of Cirriformia spirabrancha were tested for spontaneous activity and thresholds, these being (10 body wall with ventral nerve cord and head intact (2) body wall with ventral nerve cord only (3) body wall without lateral nerves. 2. All three types of body wall preparations reach differently to changes in slainity and calium ion concentrations. 3. all three types of boyd wall preparations are more sensitive to low salinities than to high salinities. 4. Two types of spontaneous activity were foud; one controlled by the head and one by the nerve cord. 5. The nervous system is divided into two opposing systems, on inhibiting and one exciting muscular activity. 6. The head region may be important for (1) controlling one type of peridic rhythm (2) inhibitng muscular activity (3) regulating ion conentrations.