LOS ANGELES — Some of the bruises found on Natalie Wood’s body may have occurred before the actress drowned in the waters off Southern California in 1981, according to a newly released coroner’s report.

Los Angeles County coroner’s officials yesterday released a 10-page addendum to Wood’s autopsy that cites unexplained bruises and scratches on her face and arms as significant factors that led to their changing her death certificate last year from a drowning to “drowning and other undetermined factors.”