Michigan Compiled Laws, Chapter 333. Health § 333.10109

Sec. 10109.(1) Subject to subsections (2) and (3) and unless barred by section 10107 or 10108, 1an anatomical gift of a decedent's body or body part for purpose of transplantation, therapy, research, or education may be made by any member of the following classes of persons who is reasonably available, in the order of priority listed as follows:

(2) If there is more than 1 member of a class listed in subsection (1)(a), (c), (d), (e), (f), (g), or (i) entitled to make an anatomical gift, an anatomical gift may be made by a member of the class unless that member or a person to which the gift may pass under section 10111  3knows of an objection by another member of the class. If an objection is known, the gift may be made only by a majority of the members of the class who are reasonably available.

(3) A person shall not make an anatomical gift if, at the time of the decedent's death, a person in a prior class under subsection (1) is reasonably available to make or to object to the making of an anatomical gift.