"
How many joints has your arm?--"Three joints: my shoulder joint, my elbow
joint, my wrist joint."
How many joints has your leg?--"Three joints: my hip joint, my knee joint,
my ankle joint."
What are joints?--"Bending places."
How many kinds of joints have you?--"Two: hinge joints, and ball-and-socket
joints."
What kind of a joint is the shoulder joint?--"A ball-and-socket joint."
Why do you call the shoulder joint a ball-and-socket joint?--"Because at
the shoulder the arm may move in any direction."
Tell how the shoulder joint is made.--"The upper end of the bone of the
upper arm is rounded and fastened in a hollow place called a socket."
Which of the joints of the arm and hand are hinge joints?--"The elbow
joint, the wrist joint, the thumb joint, the finger joints."
Which of the joints of the leg and foot are hinge joints?--"The knee joint,
the ankle joint, the toe joint."
Which of the joints of the leg is a ball-and-socket joint?--"The hip
joint."
Where is the heel?--"At the back part of the foot."
Where is the ball of the foot?--"On the sole of the foot, behind the great
toe."
Where is the hollow of the foot?--"In the middle of the sole of the foot."
Where is the sole of the foot?--"On the bottom of the foot.
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