Biology - Skeleton System


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Introduction

  • The human Skeleton system is an internal structure that provides support and strength to human body.

  • At the birth, there are about 300 bones, but over period time, specifically at maturity, the number of bones is 206.

Humans Skeleton

Classification of Bones

  • Human Skeleton system broadly classified into −

    • Axial skeleton and

    • Appendicular skeleton

  • Let’s discuss them in brief −

Axial Skeleton

  • With the total 80 bones, the axial skeleton consists of −

    • Vertebral column

    • Rib cage

    • Skull and other associated bones

Appendicular Skeleton

  • With total 126 bones, the appendicular skeleton consists of −

    • Pectoral girdles

    • Upper limbs

    • Pelvic girdle

    • Pelvis

    • Lower limbs

  • The image given below illustrates the names of the major bones of a human body.

Human Skeleton

Functions of Bones

  • Following are the major functions of skeleton system −

    • It provides support to the body

    • It protects many parts of the body, e.g. the skull protects brain; the vertebrae protect spinal cord; the rib cage protects lungs; the spine protects heart, and the sternum protects blood vessels

    • The skeleton system helps in movement

    • The skeleton system helps in the production of blood cells

    • The skeleton system stores minerals

    • The skeleton system helps in endocrine regulation



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