DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Frog anatomy, metamorphosis stage, light micrograph. Section through the head and body of a European common frog (Rana temporaria) after it has completed metamorphosis. The head is at right, with the eye (round) at centre right, and the mouth below that. The lens and retina are seen in the eye, as well as other eye layers such as the choroid and sclera. Nearby is the heart. At left, in the body cavity, are the stomach (thin red wall) and intestines (solid red areas). Cartilage (blue), that will develop into bone, and muscle (orange) are also seen. Magnification: x4 when printed at 10 centimetres wide.
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