Yeah, I think you're supposed to spit those out.
My aunt did not bother to extract them all. No one warned me in advanced and I was just kid and biting down on one provided a good laugh for everyone at the table.
These people lived through the 1930s depression and my Uncle probably lived on small game - he never got tired of it though and he would enjoy a steak from one of his cattle or a rabbit he shot that morning.