The vertebrate limb
Use the resources on Mark Hill’s Embryology site at the University of New South Wales to explore limb development.
Internal organs: insect tracheal system, vertebrate lungs, kidneys, blood vessels, heart, and teeth
Visit this series of animated human organ systems during development. Discover how well you understand the formation of these systems through participation in the assessment of the site by taking a pre-test and post-test.
The Virtual Human Embryo project at Louisiana State University in Baton Rouge has developed a digital atlas of human development. Use the link on the left for the “Heirloom collection”, then again on the left, “The Human embryonic period”. You will find a combination of photographs and drawings of human development, broken down into the 23 Carnegie stages. Go through them one by one and try to understand what is being shown. For example:
Embryologist Kathy Sulik and radiologist Peter Bream of the University of North Carolina, Chapel Hill, developed this illustrated, nine-unit tutorial of normal and abnormal mammalian development. In sequences of labeled electron micrographs and animations, the eyes, ears, heart, and other structures sprout and take shape. Watch a furrow on the embryo's back close to form the spinal cord, or slice through the center of an embryo to reveal the looping heart.