What part of the lobster are you eating when you eat lobster tail?

I just ate a steamed lobster on Saturday night. You can eat the meat in the claws, the wrists, arms, and all the tiny legs. The large part of the tail is the meatiest, and my favorite part, dipped in melted butter, of course. There is even tiny bits of meat in the tail fins that are fun to extract, since they look just like the shell shape of the shells they come out of, only much thinner. The rest I ignore, although my grandmother ate what she called, "tamale" which in a female lobster are the eggs.