Someone who seemed a bit better informed

Could be a few things - looks like part of one of the other ligaments, is usually damaged doing a 'standard' dissection, plain old 'you see what you think you should see' bias, some combo of all of the above...

And that comment is answered by:

Medicine needs more Masters and PhD students. I'm sure if they had as many students studying the body in extreme detail, like the eleventy billion English majors who write thesis/dissertations on say, Shakespeare, this would've been hammered out decades ago. XD

Which is interesting-- sometimes studying things in extreme detail "just because" (probably because the object of study has high status-- consider early observations of the planets) can pay off big.