Histogenetic Tumors ("histo," web or tissue; "genetic" (from "genesis"), generation).--In biology, the process or function of cells and cell-products.

This class of tumors are not supposed to be of embryonic origin, but develop from connective, muscular, nervous, or epithelial tissue.

The sarcoma, which grows very rapidly and becomes very large, is considered as standing between a malignant and a benign tumor.

Myxoma belongs to the mucous tissue. Fibroma belongs to the fibrous tissue. Lipoma belongs to adipose tissue. Condroma develops from cartilage. Osteoma grows from bone.

Vascular, lymphatic, angiomatous, endotheliomatous, and lymphomatous tumors are produced from serous membranes derived from the lymphatic system.

Muscular tissue gives origin to two species of tumors--namely, leiomyomata and rhabdomyomata--which correspond to the non-striped and the striped muscle fiber.