The investigations made by Dr Walter Lehmann in Central America (1907-1909), prove that these Mexican elements were extended through Guatemala, Salvador, a small part of Nicaragua (the territory of the Nicaraos) and on several places in the peninsula of Nicoya (Costa Rica) amongst the autochthonous Chorotega or Mangue.
Striped muscles possessing an autochthonous tonus appear to be the various sphincter muscles.
Each of these radiations produced a greater or less number of analogous groups, and while originally independent the animals thus evolving as autochthonous types finally mingled together as migrant or invading types.
Nevertheless, it is not probable that without the training introduced by Lycurgus the Spartans would have been successful in securing their supremacy in Laconia, much less in the Peloponnese, for they formed a small immigrant band face to face with a large and powerful Achaean and autochthonous population.
It may be possible either that these tribes are the autochthonous inhabitants who dwelt in Guatemala, Salvador, Honduras and Nicaragua before the immigration of the prehistoric Maya peoples; or else that they invaded this region after it had been deserted by a prehistoric oriental branch of the Maya family.
The lexicographers mention as characteristics of the Eupatridae that they are the autochthonous population, the dwellers in the city, the descendants of the royal stock.
The earliest inhabitants of Laconia, according to tradition, were the autochthonous Leleges.
Gastrocnemius, tonic contraction obtains; but this, like the last mentioned, is not autochthonous in the muscles themselves; it is indirect and neural, and appears to be maintained reflexly.