Michigan Compiled Laws, Chapter 4. Legislature § 4.262

Sec. 2.(1) The supreme court shall have original and exclusive state jurisdiction to hear and decide all cases or controversies in Michigan's 1 court of justice involving a redistricting plan under this act. A case or controversy in Michigan's 1 court of justice involving a redistricting plan shall not be commenced in or heard by the state court of appeals or any state trial court.

(2) If a case or controversy involves a legislative redistricting plan but an application or petition for review has not been filed under subsection (3) or section 3, 1the supreme court may, but is not required to, undertake all or a portion of the procedures described in section 4. 2

(3) Upon the application of an elector filed not later than 60 days after the adoption of the enactment of a redistricting plan, the supreme court, exercising original state jurisdiction provided under section 6 of article IV of the state constitution of 1963, may review any plan enacted by the legislature, and may modify that plan or remand that plan to a special master for further action if the plan fails to comply with section 1 or 1a.  3