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).
Knee Muscles. 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 other muscles closely linked are the two calf muscles, which control how the ankle moves as well as the knee.ther Knee Muscles. There is a muscle behind the knee joint itself called popliteus which helps the knee to twist and aids stability of the knee. The other muscles around the knee are the calf muscles (gastrocnemius and soleus) which attach just above and below the knee.