Actually, missing because of a high-side on a motorcycle years ago. I did break some bones, but also tore through the ligament. Well, I guess it died from lack of being attached or whatever and was gone by the time they got an MRI on it
It allowed the bicep to regularly pop out of the humeral groove, which I assure you was not pleasant
Seconding OpenCourseWare. I used that a lot before and during undergrad (engineer with math minor).
I do recommend checking out the “fun” math videos as well because you’ll learn a lot and it’s fun, like Numberphile, 3 blue 1 brown, etc