By Maddie Rosen Source: go.edu/book- tools.html

Hands, Hands Everywhere! 27 bones 34 muscles 48 nerves Source: m/medicallibrary/

Manufacturing Limbs Recipe for a limb: One Bone upper Two Bones lower Nine bone wrist Five finger rods Exceptional Similarities Source: go.edu/book- tools.html

Origin of Limbs Lepidosiren paradoxa Eusthenopteron Ichthyostega Acanthostega gunnari Source: go.edu/book- tools.html

Tiktaalik Fin with Owen’s pattern Environment Source: go.edu/book- tools.html

Discussion Why do you think a limb is set up the way it is? If you were to create a limb would you use more or less bones? Which areas of the arm would you change? What do you think Tiktaalik used its advanced arms for? Do you think it was mostly a mud-dwelling or water-dwelling animal? Why? What do you think lead to the change in lifestyle from fish to Tiktaalik? Why do you think we evolved to be land dwelling creatures and not an intermediate like Tiktaalik?