PBS
Pbs Learning Media: Tetrapod Limbs
This illustration from Evolution by Monroe W. Strickberger shows the remarkable similarities between the bones in the forelimbs of various tetrapods, all of whose limbs serve very different functions.
Other
Get Body Smart: Human Anatomy and Physiology: Skeletal System
Students can learn about the human skeletal system through this easy-to-access tutorial. Sections include an introduction, organization of the skeleton, appendicular skeleton, and the axial skeleton. Interactive quizzes for each section...
OpenStax
Open Stax: Muscles of the Pectoral Girdle and Upper Limbs
This site provides interactive information regarding the muscles of the pectoral girdle and upper limbs.