Mn, Mandible. Hy, Hyoid. Br1Br2, Br3, Branchial arches. Gl, Glottis. Tr, Trachea. Ivc, Inferior vena cava. V, Ventricle. Au, Auricles. Rsvc, Lsvc, right and left superior cavae. Ta, Truncus arteriosus. Ao, Left aortic arch. P.A. Right pulmonary artery. The pericardium (lightly shaded) extends as far as the bifurcation of the synangium.
Illustration from 1911 Encyclopædia Britannica, article Batrachia.
This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.
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