Experimental manubrium sterni Procedure 1.Dissection Procedures Destroy the brain and spinal cord of a toad and fasten it to a board,ventral side up; Use scissors to make a longitudinal incision on chest wall to expose the heart manubrium sterni 1.Dissection Procedures : • Destroy the brain and spinal cord of a toad and fasten it to a board, ventral side up; • Use scissors to make a longitudinal incision on chest wall to expose the heart ; Experimental Procedure