Michigan Compiled Laws, Chapter 600. Revised Judicature Act of 1961 § 600.308

Sec. 308. (1) The court of appeals has jurisdiction on appeals from all final judgments and final orders from the circuit court, court of claims, and probate court, as those terms are defined by law and supreme court rule, except final judgments and final orders described in subsections (2) and (3).A final judgment or final order described in this subsection is appealable as a matter of right.

(2) The court of appeals has jurisdiction on appeal from the following orders and judgments that are reviewable only on application for leave to appeal granted by the court of appeals:

(3) An order concerning the assignment of a case to the business court under chapter 80  2is not appealable to the court of appeals.

(4) The court of appeals has exclusive original jurisdiction over any action challenging the validity of section 6404, 6410, 6413, or 6419.  3