A female physician's assistant, working inside the G. Robert Cotton Correctional Facility in Jackson, was found Wednesday evening on the floor of the healthcare building.
A source within the Michigan Department of Corrections said when found the woman was conscious, but disoriented.
The woman was assaulted and stabbed. She was taken to the hospital where she was treated and released Thursday.
The facility is located northwest of Elm Road and I-94 in Jackson County.
The Michigan Department of Corrections and the Michigan State Police are investigating the incident and interviewing both inmates and employees.