It's been less than a week since news broke that Ronda Rousey was joining "9-1-1" Season 3, and she has already shed blood for the show.

TMZ reported Tuesday that the MMA fighter badly injured her hand while filming a scene in Mexico last week. Once the word was out, Rousey shared more details about the "freak accident" that occurred. It turns out that a boat door fell on her hand during a scene, almost severing one of her fingers. The wildest part, though, is that Rousey, being used to a lot of pain, didn't even look to see the extent of the problem until after the director yelled "cut." At that point, actual first responders had to be called into action.

Rousey posted a photo on Instagram on Tuesday, and it's not pretty. (You can see it here, if you're curious.) In her caption, she explained more about her grisly injury.

"So the word is out I nearly lost my finger shooting @911onfox," sh wrote in part. "Freak accident, first take of the day a boat door fell on my hand, I thought I just jammed my fingers so I finished the take before looking (I know it sounds crazy, but I’m used to live audiences and never showing pain unless I’m supposed to) after a break in the action I told our director the situation and was rushed via ambulance to the hospital where they promptly reattached my bone and tendon with a plate and screws."

Gruesome as the injury was, Rousey was back on set and filming the next day. Clearly, it takes more than a nearly severed finger to keep her down.

"9-1-1" Season 3 premieres Monday, Sept. 23 at 8 p.m. ET/PT on Fox.

[via: TMZ; Ronda Rousey/Instagram]