The image is a vintage black and white medical illustration of a model of a human embryo's heart. The heart is depicted as a three-dimensional, somewhat bulbous structure with various labeled parts. The heart is approximately 4.6 mm long and is labeled as being from Dr. Begg's embryo. The illustration is detailed, showing the complex shape of the embryonic heart. Several lines and labels are present, indicating specific anatomical features. The illustration is accompanied by text at the bottom, identifying the creators (F.T. Lewis and M.E. Abbott) and the source (Anatomical Laboratory of the Harvard Medical School). The style is reminiscent of early 20th-century medical illustrations, with a focus on accurate representation and detailed labeling.