Tex. Const. art. V, § 17

The County Court shall hold terms as provided by law. Prosecutions may be commenced in said court by information filed by the county attorney, or by affidavit, as may be provided by law. Grand juries empaneled in the District Courts shall inquire into misdemeanors, and all indictments therefor returned into the District Courts shall forthwith be certified to the County Courts or other inferior courts, having jurisdiction to try them for trial; and if such indictment be quashed in the County, or other inferior court, the person charged, shall not be discharged if there is probable cause of guilt, but may be held by such court or magistrate to answer an information or affidavit. A jury in the County Court shall consist of six persons; but no jury shall be empaneled to try a civil case unless demanded by one of the parties, who shall pay such jury fee therefor, in advance, as may be prescribed by law, unless the party makes affidavit that the party is unable to pay the jury fee.