Power refers to forceful uterine contractions, passenger refers to the fetus, and passage refers to the route that the fetus has to travel through the bony pelvis.
And the reason behind that is supposedly because the Japanese diet consists of large amounts of whole, bony fish, and the pointed ends makes it easier to remove small bones from the fish.
But when your ulnar nerve reaches your elbow, it runs beneath the bony bump at the bottom of your humerus, named the medial epicondyle, and it passes through a tunnel of ligament and muscle tissue called the cubital tunnel.