Bones can be split up into two categories; Axial bones – bones that keep you upright such as the spinal column and hips – and Appendicular bones - -bones that help with movement such as the arms and legs. When a baby is born they have 270 bones but that number decreases to 206 when the adult reaches the age of 21.
Your cranium, otherwise known as the skull, is one large bone that protects the brain and helps form the facial structure.
The ribcage protects the lungs, heart and liver and can be seen in pairs of twelve on each side. Some ribs are fixed – fixed ribs are connected to the sternum and the vertebrae – while floating ribs are connected to the vertebrae only. The spine contains thirty-three vertebrates which run from the base of the cranium to the top of the pelvis. The spine holds the body upright and protects the spinal cord which carries nerves from the brain to other parts of the body.
Arms and legs have a similar structure to them. In the arm, the bone at the top is named the humorous, and the bones further down are named the ulna and radius. In the leg the thigh bone (longest bone in the body) is called the femur, and the two further down the leg are called the tibia and fibula.
The pelvis, also known as the hips, connect the torso to the lower body together. In your body, there are joints, the two main types of joints are the ball and socket joints, and hinge joints which are in the shoulder and pelvis, and hinge joints in your knee, elbow, wrists, ankles and knuckles.
To keep your bones healthy and strong, you must eat calcium rich foods, and get enough vitamin D which you receive from the sunshine.
Niamh Patterson, 6th class, 29.1.19.