Introduction to Skleton- 2

The appendicular skeletal system is the part of the human skeleton made up of the limbs and the girdles that attach them to the body. While the axial skeleton forms the central structural core, the appendicular skeleton provides the necessary support and movement for daily activities.

Upper and lower limbs

• Limbs in the human body are grouped into upper limbs and lower limbs.
• The upper limbs consist of the hands and arms, enabling actions like picking up items, eating, and touching things.
• The lower limbs consist of the legs, providing the essential support needed to stand upright.
• Legs also allow people to walk, run, and perform everyday movements.

The role of girdles

Bones cannot simply be glued onto the central body, so the body relies on specialized connecting bones called girdles. Just as a shirt needs a hanger or hook to hang properly on a wall, limbs need girdles to connect firmly to the body frame. The pectoral girdles are the shoulder bones that attach both arms to the upper body. The pelvic girdles are the hip bones that attach both legs to the lower body.

Comparing axial and appendicular systems

• The axial skeletal system consists of three main structures: the skull, the vertebral column, and the rib cage.
• The axial bones alone are not enough to provide active movement to the body.
• Full movement and support require the addition of the hands, legs, and their connecting girdle bones.
• Together, the axial skeletal system and the appendicular skeletal system form the complete skeletal framework of the human body.

Support and daily movement

Movement and balance in everyday life depend entirely on the components of the appendicular skeletal system. The upper limbs and their pectoral girdles allow people to interact with objects through grasping, lifting, and eating. The lower limbs and their pelvic girdles provide the continuous support needed to bear the body's weight, balance while standing, and travel by walking or running.