Specialized (Conducting) Tissue in the Turtle Heart

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Abstract
In the turtle heart connective tissue, nerves, ganglia, ordinary heart muscle and still another type of tissue are present. Five types of tissue are found in the A-V funnel, i.e., connective, auricular muscle, smooth muscle, nerve and this other tissue. This extra tissue forms a considerable part of the funnel. The main structural reason for supposing that this tissue may be the conducting pathway is its direct fusion with ventricular muscle.. While there may be some junctions of auricular muscle to ventricular muscle, the junctions seen under oil immersion with the phase scope are with the Purkinje-like tissue.