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BONES

BONES. The Skeleton. -Contains approx. 206 bones. -Main function: rigid framework for support, protection, and storage. -The human skeleton is divided into two parts: 1. axial (skull, ribs, spine, sternum) 2. appendicular (everything else). Bone Structure.

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BONES

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  1. BONES

  2. The Skeleton -Contains approx. 206 bones. -Main function: rigid framework for support, protection, and storage. -The human skeleton is divided into two parts: 1. axial (skull, ribs, spine, sternum) 2. appendicular (everything else)

  3. Bone Structure Bone Marrow --- Red and Yellow • Red Marrow --- Produces red blood cells & certain types of white blood cells. • Yellow Marrow --- Consists of fat cells & serves as energy storage.

  4. Bones Continued Periosteum --- Membrane that contains a network of blood vessels which supplies nutrients. (Outer layer of the bone.) Compact bone --- Allows the bone to endure a large amount of stress it receives upon impact. Spongy Bone - Network of connective tissue.

  5. Bone develops from cartilage. Cartilage is a tough, flexible connective tissue. Cartilage will eventually harden during fetal development in a process called ossification.

  6. Joints Joints are places where two bones meet. Joints are held together by ligaments, tough bands of connective tissue. Bursae help to absorb shock & keep bones from rubbing against each other. Tendons attach muscle to bones.

  7. Hinge Joint • Found in your elbow. Allows you to move arm forward & backward. Like a door.

  8. Allows bones to slide over one another. Example are the joints between the small bones of your feet. Allows your foot to flex when you walk. Gliding Joint

  9. Forms the top 2 vertebrae in your neck. Allows you to move your head side to side. (Saying “no”). Pivot Joint

  10. Found in your shoulder or hip. Allows you to move your arm up & down, forward & backward, & rotate in a complete circle. Ball & Socket Joint

  11. Saddle Joint • Found at the base of each thumb, allows you to rotate your thumbs and helps you grasp objects with your hand.

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