Bones
The skeletal system is a set of bones that are the structure for the body. Their two main uses are to shape the body and to protect the organs within the body. There are over 300 bones in a human skeleton, but here are 5 examples:
Image from "http://en.wikipedia.org/wiki/Human_skeleton"
Humerus
The humerus is a long bone. It is located in the upper part of your arm. It extends from the shoulder to the elbow and is attatched to at least four or five muscles. Some of these are the deltoid, biceps brachii, and the triceps brachii. The humerus is an important bone because it makes up about half of your arm.
Image from "http://en.wikipedia.org/wiki/Humerus"
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Raduus
The radius is a long bone. It is located in the lower part of your arm. It extends from the elbow to the wrist. it is attatched to many muscles, including many of the ones that move your fingers. It is connected to the ulna and carpals. It is also involved in the rotation of the arm. It helps rotate the arm because it and the ulna form a pivot joint. The radius is an important bone because it makes it easier to manuver your arm.
Image from "http://en.wikipedia.org/wiki/Radius_%28bone%29"
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Ulna
The ulna is also a long bone. It is located, like the radius, in the lower part of your arm. It extends from the elbow to the wrist and works with the radius to make a pivot joint. It is an important bone because it takes up a large part of the arm, as well as helps the arm rotate. The ulna is also attached to to many muscles. Lastly, it is attached to the humerus with a hinge joint.
Carpals
The carpals are the small, irregularly shaped bones that make up your wrist. they are connected with gliding joints so they can move in almost any direction. They are attached to the radius, ulna, and metacarpals. The carpals are inmportant bones because they make up the wrist; they allow you hand to move in many directions.
vertebrae
The vertebrae are oddly shaped bones -- almost disc-shaped. The vertebrae are connected by gliding joints to give them a large flexibility area. They make up a chain down your back -- your backbone. vertebrae are important for two reasons. They make up the structure for your whole body and contain your spinal chord, which controls everything you do.
Image from "http://en.wikipedia.org/wiki/Vertebral_column"
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