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© Collegial Centre for Educational Materials Development, 2007 • www.ccdmd.qc.ca • info@ccdmd.qc.ca

6220, Sherbrooke Street East, Suite 416, Montréal (Québec) H1N 1C1 • Telephone: (514) 873-2200 • Fax: (514) 864-4908

Medullary Reflexes 2.0 www.ccdmd.qc.ca/ri/reflexes-e/

Science CD and Web site

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This software program allows users to study the plain and simple medullaryreflexes of a frog in which the spinal cord has been removed from the influencesof the encephalic centres. The frog seen is a spinal frog. A menu allows users toselect from ten possible experiments. A medullary reflex can be triggered simplyby applying an acetic acid solution on a specific spot (the toes) of the spinalfrog's left foot. When solutions of increasingly concentrated acetic acid areapplied, the contractions will extend to a greater number of muscles. This allowsusers to see increasingly more complex reflexes in the stimulated animal. Theuse of ether, curare, scissors, a needle, and a scalpel allow users to modifyfunctional elements of the frog's reflex arch and thus check the role played byeach one of the elements in the exteroceptive medullary reflex. Students canstudy the frog's exteroceptive medullary reflexes on their own or by following aseries of instructions. They can explore the animal's responses at differentanatomical and histological levels by using various parameter combinations.

Author(s): Jocelyn LavalléeInstitution: Collège de MaisonneuveSoftware Design: Robert SzczechGraphic Design: Nathalie Brunelle

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