Structure of the skeletal system

Connecting bone names to movement

The skeletal system is the body's framework of bones. To understand its contribution to sport, connect three things: where a bone is, how its shape is classified, and what it helps a performer do.

Bones do not move themselves. Muscles pull on bones through tendons, and the bones act as levers to produce movement at joints. Other bones provide protection, bear weight or give muscles a secure place to attach. A football kick, for example, involves long bones acting as levers, while the supporting foot bears the player's weight.

Head, chest and shoulder bones

The cranium is the part of the skull enclosing the brain. Its flat bones form a protective casing, particularly important when a performer experiences an impact in a contact sport. This protection does not make the brain immune to injury.

The ribs curve around the chest, and the sternum, or breastbone, lies at the centre of the front of the chest. These are flat bones forming a protective cage around the heart and lungs. Protecting these organs matters during physical activity because the heart and lungs help supply working muscles with oxygen.

The clavicle, or collarbone, lies across the upper chest and is a long bone. It helps support the shoulder, contributing to arm movements such as a golf swing. The scapula, or shoulder blade, lies at the back of the shoulder. It is a flat bone with surfaces for muscle attachment: these muscles help control the shoulder and arm during throwing or lifting.

Flat bones therefore have different applications. The cranium is a clear example of protection; the scapula is a clear example of muscle attachment.

Following the arm into the hand

The humerus is the long bone of the upper arm. Muscles pull on it during actions such as raising the arm for a volleyball serve. The radius and ulna are the two long bones of the forearm. Together, they contribute to the positioning and movement of the forearm and hand, helping a cricketer control a bat.

Moving from the forearm towards the fingertips gives this sequence:

Long describes a bone's shape, not whether it looks large. Finger bones are much smaller than the humerus, but they are still long bones because they are longer than they are wide or deep.

The vertebral column: five regions with different roles

The vertebral column, or spine, runs down the back. Its individual bones are called vertebrae and are classified as irregular bones. Their shapes provide support and muscle attachment, and the column protects the spinal cord, which carries nerve signals between the brain and body.

The five regions run from the neck to the base of the spine:

The upper regions contain separate vertebrae, while the sacrum and coccyx contain fused vertebrae. The spine is therefore not simply a chain of identical, equally movable bones.

Pelvis, legs and feet

The pelvis is the basin-shaped structure below the spine. It is classified as irregular in this skeletal overview. It provides attachment points for muscles involved in powerful leg actions, such as sprinting and kicking, and connects the trunk with the lower limbs.

The femur is the long bone of the thigh. It acts as a lever when muscles move the leg during cycling or a football kick. Below the knee, the tibia and fibula are the two long bones of the lower leg. They contribute to lower-leg support and movement during running, kicking and changing direction.

The patella, or kneecap, lies at the front of the knee. It is a specialised bone within a tendon, anatomically called a sesamoid bone. It helps protect the tendon from friction against the femur as the knee bends and straightens during actions such as squatting or jumping.

The foot follows a similar naming pattern to the hand:

Explaining a bone's contribution to performance

A useful explanation moves from bone → role → sporting action. For example, the scapula is a flat bone providing muscle attachment. Those attached muscles help move and control the arm during a throw. The tarsals are short bones suited to weight bearing, supporting the performer as they land from a jump.

These examples show why knowing only a bone's name is not enough: its location and classification help explain its contribution to performance.