Tenn. Code Ann. § 13-3-203

For the purpose of enabling any community planning commission to carry out the powers and duties as set forth in chapter 7 of this title, “chief legislative body,” as used in § 13-7-201, is broadened to include the regular legislative body of any county in which any incorporated community lies, and the county legislative body shall serve as the chief legislative body of any community planning commission created under the terms of this part.