The pattern of shared bones in all the tetrapods is "one bone, two bones, many and then digits".
The humerus in the arm and the femur in the leg are two bones that articulate with a series of tiny blobs that link with the fingers or toes. All limb architecture is based on this design. In this manner, all the tetrapods share a common skeletal architecture.
The four limbs of tetrapods serve as an illustration of homologous features. Mice, crocodiles, birds, bats, and bats all have four limbs. Bony fish and sharks don't. Tetrapods evolved four limbs, and their offspring have retained this trait. Having four limbs is therefore a homology.
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