24. The least complex type of joint allows one-directional movement in our elbows, our fingers and toes, and (in a modified form) in our knees. What is this simple type of joint called?
From Quiz Nice Bones in a Joint Like This
Answer:
hinge joint
Each of the hinge joints in the human body is more complex than a door hinge, but the same principle applies. With the help of muscles, tendons, and ligaments, hinge joints act as simple machines, like levers. Unlike a ball-and-socket joint, which can move in circles and in many directions, a hinge joint only moves back and forth in one direction. Ellipsoidal joints (also called condyloid joints) can move in two planes and are found in the wrists and ankles. There are hinge joints in the phalanges (fingers and toes), but the word "phalanges" refers to the finger and toe bones, not a type of joint.
Let's sing along with a traditional American spiritual often used to teach about some of the major bones that comprise the human skeleton. 
There are 206 bones in a adult human body. They provide protection, blood cell production, transmission of sound, and without them you'd be a puddle on the ground as your bones give your body its structure and mobility. 
There's nothing funny about the human body. In fact, this here is a no-nonsense look at the different components of the skeleton. No bones about it. 
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