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The heart of a frog (Rana esculenta) from the front. Labels: V, ventricle, Ad, right auricle; As, left auricle; B, bulbus arteriosus, dividing into right and left aorta.

Heart of a Frog

The heart of a frog (Rana esculenta) from the front. Labels: V, ventricle, Ad, right auricle; As, left…

The heart of a frog (Rana esculenta) from the back. Labels: s.v., sinus venosus opened; c.s.s., left vena cava superior; c.s.d., right vena cava superior; c.i., vena cava inferior; v.p., vena pulmonales; A.d., right auricle; A.s., left auricle; A.p., opening of communication between the right auricle and the sinus venosus.

Heart of a Frog

The heart of a frog (Rana esculenta) from the back. Labels: s.v., sinus venosus opened; c.s.s., left…