Autochthony

pertaining to autochthons; aboriginal; indigenous (opposed to heterochthonous).
Pathology.

found in the part of the body in which it originates, as a cancerous lesion.
found in a locality in which it originates, as an infectious disease.

Psychology. of or relating to ideas that arise independently of the individual’s own train of thought and seem instead to have some alien or external agency as their source.
Geology. (of rocks, minerals, etc.) formed in the region where found.
Compare allochthonous.
Historical Examples

After the lapse of time the theory of autochthony (from autos, self, and chthon, earth) was laid aside.
Myths and Legends of Ancient Greece and Rome E.M. Berens

adjective
(of rocks, deposits, etc) found where they and their constituents were formed Compare allochthonous
inhabiting a place or region from earliest known times; aboriginal
(physiol) (of some functions, such as heartbeat) originating within an organ rather than from external stimulation
adj.

“native, indigenous,” 1845, from autochthon + -ous.

autochthonous au·toch·tho·nous (ô-tŏk’thə-nəs)
adj.

Native to the place inhabited; indigenous.

Originating in the place where found. Used of a disease originating in the part of the body where found, or of a disease acquired in the place where the patient is.