The appendicular skeleton includes the bones in our arms and legs and how they connect to the rest of our body (the axial skeleton). Here are the main parts:

1. Pectoral Girdle

   • Clavicles: These are the collarbones. They connect our arms to our body, helping keep the shoulders steady and letting us move our arms in many ways.
   • Scapulae: Also known as shoulder blades, they are important for moving our arms and are places where lots of muscles attach.

2. Upper Limbs

   • Humerus: This is the bone in our upper arm that helps us move our arm and forearm.
   • Radius and Ulna: These two bones in our forearm help us twist our wrist and bend it.
   • Carpals, Metacarpals, and Phalanges: These are the bones in our wrist, hand, and fingers. They help us make precise movements and grip things.

3. Pelvic Girdle

   • Hip Bones (Pelvis): Made up of three parts called ilium, ischium, and pubis, these bones support the weight of our upper body and help us stay steady when we walk.

4. Lower Limbs

   • Femur: This is the thigh bone. It's the strongest bone in our body and is important for walking and running.
   • Patella: This is the kneecap, which protects our knee joint and helps our leg muscles work better.
   • Tibia and Fibula: These are the bones in our lower leg. The tibia carries weight, while the fibula keeps the ankle stable.
   • Tarsals, Metatarsals, and Phalanges: These bones support our weight when we're standing and allow our toes to move.

All these bones work together to help us move, hold our body weight, and give muscles a place to attach. They show how flexible and strong our skeletal system is!