I think my daughter's experience is similar to Mo's age-wise - except the dissections - I think they do it in middle school. However, they begin cursive in kindergarten. Something I found quite odd, but they write much better than I do so who is to argue?
I don't remember diagraming sentences - I had to learn it to test my daughter. I did not dissecte until middle or high school, but I do remember in elementary school having a doctor come in and show us a pig's heart, cutting into it and showing the chambers and so forth.
I don't remember exactly when I did alot of that stuff like multiplying, etc. But it seems my daughters are doing things earlier or at least they have a heck of alot more homework. I don't remember getting much homework until middle school.
I was 18 when I graduated.