What is ADHD? ADHD (attention deficit-hyperactivity disorder) affects both adults and school-aged children. Symptoms include restlessness, difficulty paying attention, and hyperactivity. The causes of ADHD are unknown, however factors such as diet, environment and genetics may contribute to symptoms.
The knee muscles control how the knee joint and patella move. There are two main groups of muscles, the quadriceps and the hamstrings, as well as a small muscle behind the knee (popliteus).
The hamstrings are the main group of muscles that make the knee flex. There are also other muscles that aid flexion which also rotate the knee in the medial lateral directions. There are two parts to this muscle, the long head and short head. The long head originates from the rear of the pelvis and the short head from the rear of the femur.