Tex. Const. art. 5, § 8

JURISDICTION OF DISTRICT COURTS. District Court jurisdiction consists of exclusive, appellate, and original jurisdiction of all actions, proceedings, and remedies, except in cases where exclusive, appellate, or original jurisdiction may be conferred by this Constitution or other law on some other court, tribunal, or administrative body. District Court judges shall have the power to issue writs necessary to enforce their jurisdiction. The District Court shall have appellate jurisdiction and general supervisory control over the County Commissioners Court, with such exceptions and under such regulations as may be prescribed by law. (Feb. 15, 1876. Amended Aug. 11, 1891, Nov. 6, 1973, and Nov. 5, 1985.)