Homunculus

The concept of a homunculus (Latin for "little man", plural "homunculi"; the diminutive of homo, "human being") is often used to illustrate the functioning of a system. In the scientific sense of an unknowable prime actor, it can be viewed as an entity or agent.

“Preformationism,” a theory of heredity, claimed either the egg or the sperm (exactly which was a contentious issue) contained a complete preformed individual called a homunculus. Development was therefore a matter of enlarging this into a fully formed being. In the days of preformationism, genetic disease was variously interpreted: sometimes as a manifestation of the wrath of God or the mischief of demons and devils; sometimes as evidence of either an excess of or a deficit of the father's “seed”; sometimes as the result of “wicked thoughts” on the part of the mother during pregnancy. On the premise that fetal malformation can result when a pregnant mother's desires are thwarted, Napoleon passed a law permitting expectant mothers to shoplift.

For further informaton, please see the Wikipedia entry: Homunculus