Bone is a tissue, a living material made up of cells, and is it full of capillaries. • The skeletal system is made up of bones which are connected to each other by joints. • Almost all bones have at least one joint. Muscles are fibres that have the ability to contract so that we can move our bodies and internal organs. • All these elements make up the musculoskeletal system whose function it is to allow us to perform movement.
General Structure of the Human Body • 3 Anatomical regions of the body: • Head • Trunk • Limbs
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How many bones are there in the human skeleton? • How many bones in a newborn’s skeleton? • Why the difference?
How many bones are there in the human skeleton? 206 • How many bones in a newborn’s skeleton? 270 • Why the difference? During development, your bones fuse together
Give examples of bones that fuse during development. • http://www.pennmedicine.org/encyclopedia/em_DisplayAnimation.aspx?gcid=000112&ptid=17
The Skeletal System Function • forms an internal, living framework that • provides shape and support • protects internal organs • moves body • forms blood cells • stores calcium and phosphorous compounds for later use
Joints • Definition: • Any place where two or more bones come together
Joints • Kept far enough apart by a thin layer of cartilage so that they do not rub against each other as they move • When this happens it can cause swelling at the joint and create symptoms of arthritis. • Bones are held in place at joints by a tough band of tissue called ligament
Types of Joints • Fixed • Skull • Pelvis • Semi-movable • Vertebral column • Moveable • Pivot • Ball & socket • Hinge • Gliding
Types of Joints • Ball and Socket Joint • Bone with a rounded end that fits into a cuplike cavity on another bone • ex: shoulder joint: scapula to humerus http://www.shockfamily.net/skeleton/JOINTS.HTML
Types of Joints • Pivot Joint • One bone rotates in a ring of another bone that does not move • ex: radius and ulna • ex: neck joint http://www.funhousefilms.com/b-pivot2.jpg
Types of Joints • Hinge Joint • Back-and-forth movement like hinges on a door • ex: elbow joint (humerus into radius) http://www.shockfamily.net/skeleton/JOINTS.HTML
Type of Joints • Gliding Joint • One part of a bone slides over another bone • ex: carpals into metacarpals http://www.shockfamily.net/skeleton/JOINTS.HTML
Video- joints • http://www.youtube.com/watch?v=ecRoUeL5k6E • http://www.youtube.com/watch?v=sW3-9zM9ohE