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).
Fig 1.1 â Muscles in the deep layer of the posterior leg. The popliteus is located superiorly in the leg. It lies behind the knee joint, forming the base of the popliteal fossa. There is a bursa (fluid filled sac) that lies between the popliteal tendon and the posterior surface of the knee joint.ig 1.1 â Muscles in the deep layer of the posterior leg. The popliteus is located superiorly in the leg. It lies behind the knee joint, forming the base of the popliteal fossa. There is a bursa (fluid filled sac) that lies between the popliteal tendon and the posterior surface of the knee joint.