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Updated: May 10, 2025
In every case the first trace of the limb in the embryo is a very simple protuberance that grows out of the side of the hyposoma. These simple structures develop directly into fins in the fishes and Dipneusts by differentiation of their cells.
The heart of all the Vertebrates belongs originally to the hyposoma of the head, and we accordingly find it in the embryo of man and all the other Amniotes right in front on the under-side of the head; just as in the fishes it remains permanently in front of the gullet.
This also applies originally to the primary muscles of the limbs, as these too belong phylogenetically to the hyposoma. The chief of the vegetal organs of the human frame, to the evolution of which we now turn our attention, is the alimentary canal.
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