Anatomy of the Human Leg with all its Systems ✨ . . The human leg consists of several key systems and components: Skeletal System Femur: Thigh bone, the longest in the body. Patella: Kneecap, protects the knee joint. Tibia: Shin bone, larger and weight-bearing. Fibula: Smaller bone alongside the tibia. Tarsals: Seven ankle bones. Metatarsals: Five foot bones. Phalanges: Toe bones. Muscular System Quadriceps: Four muscles extending the knee. Hamstrings: Three muscles flexing the knee. Gastrocnemi