Most cadavers used in medical schools come from people who voluntarily donated their bodies before death through programs known as willed body programs. Nearly every medical school in the United States operates one of these programs or partners with a university that does. A smaller and more controversial share of cadavers comes from unclaimed bodies released by county morgues or coroners’ offices.
Willed Body Donation Programs
The primary pipeline for cadavers is straightforward: living adults register with a medical school’s body donation program, and when they die, their body is transferred to that institution. UC Davis, for example, has operated its Body Donation Program since 1968. The process typically involves filling out a donor application, receiving approval and a donor identification card with a unique number, and instructing next of kin to call the program within 24 hours of death.
That 24-hour window is critical. A donated body must reach the medical school quickly enough to be preserved before decomposition begins. This timeline generally rules out traditional funerals, body viewings, or wakes before the transfer. A funeral director associated with the school handles the physical transport from the place of death to the institution.
The legal backbone for this system is the Uniform Anatomical Gift Act, first passed in 1968, which allows any person 18 or older to designate their body or body parts as an anatomical gift effective upon death. A key provision: once a donor makes this gift and doesn’t revoke it before death, the donation is irrevocable. No family member can override it afterward. Every state has adopted some version of this law, though the specific language varies.
Who Pays for the Process
Body donation is generally free for the donor and their family, but “generally” does real work in that sentence. The medical school covers the cost of preservation and eventual cremation. Transportation, however, can get complicated. Mayo Clinic, for instance, maintains a limited fund to reimburse funeral homes for transporting a body to Rochester, Minnesota. If the donor dies out of state, the family is responsible for hiring a local funeral home to handle the initial transfer and all required paperwork, including permits, coroner authorization, and the death certificate. Any transportation costs that exceed the school’s reimbursement fund fall to the family or the donor’s estate.
Not Every Body Is Accepted
Medical schools need intact, well-preserved specimens for students to study anatomy in detail. That means they turn away a significant number of potential donations. According to Mayo Clinic’s criteria, a body may be rejected if the donor had an infectious disease such as HIV/AIDS, hepatitis B or C, tuberculosis, active MRSA, or prion diseases like Creutzfeldt-Jakob disease. Bodies that have already been autopsied, embalmed by a funeral home, or had organs removed (other than eyes or skin) are also excluded.
Physical condition matters too. Extremely emaciated or extremely obese bodies, or those with extensive surgical history that has significantly altered the anatomy, may not serve the educational purpose well enough to accept. Decomposition is an automatic disqualifier, which is why the 24-hour notification window exists.
How Cadavers Are Preserved
Once a body arrives at a medical school, it undergoes a specialized embalming process designed for long-term preservation, not the cosmetic preparation a funeral home performs. The cornerstone chemical is formaldehyde, which has been the foundation of anatomical preservation since its discovery in 1869. Modern embalming solutions typically combine formaldehyde with other compounds like alcohol and various salts that prevent bacterial growth and keep tissues firm enough for months of dissection.
The goal is to maintain the body in a state where students can identify muscles, nerves, blood vessels, and organs over the course of an entire academic year. This is a very different standard from funeral embalming, which only needs to last days or weeks.
Unclaimed Bodies: A Controversial Source
Voluntary donation accounts for most cadavers, but it isn’t the only source. In most U.S. states, counties can legally release unclaimed bodies to medical schools without consent from the deceased or their next of kin. A 2023 study published in JAMA found that roughly 40% of medical schools in Texas had direct or possible use of unclaimed bodies for education between 2017 and 2021. The share of unclaimed bodies among those accepted by Texas medical schools actually increased during that period.
This practice raises serious ethical concerns. Unclaimed bodies disproportionately come from people who were homeless, incarcerated, mentally ill, or otherwise marginalized. Using their remains without consent echoes a long, troubling history in anatomical education. Many institutions have moved away from accepting unclaimed bodies entirely, but the practice persists in states where laws allow it and voluntary donations fall short of demand.
Private Donation Organizations
Beyond university-run programs, private organizations known as non-transplant anatomical donation organizations (NADOs) also collect and distribute bodies. These groups accept donations, often covering all costs to the family, and then supply preserved specimens to medical schools, device manufacturers, and surgical training programs. They fund their operations by charging fees to the institutions requesting the bodies. University-based programs, by contrast, may be funded through state grants or tuition.
The NADO industry is less regulated than organ transplantation. Unlike transplant tissue banks, which operate under federal oversight, whole-body donation lacks a unified national regulatory framework. Some NADOs are accredited through the American Association of Tissue Banks, but accreditation is voluntary. This gap has occasionally led to scandals involving mishandled remains or bodies used for purposes donors didn’t anticipate.
What Happens After Dissection
A cadaver is typically used for one to two academic years. After students have completed their coursework, the remains are cremated. Most medical schools hold annual memorial or gratitude ceremonies where students honor their donors, sometimes inviting the donors’ families. Cremated remains are either returned to the family if requested or interred by the school, often in a dedicated memorial site. Many students describe the experience of working with a donor as one of the most formative moments in their training, and these ceremonies reflect that weight.