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).
Hamstrings. The hamstrings are three muscles that run down the back of the leg to cross the knee joint. They work together to bend or flex the knee. The tendons of the semimembranosus and the semitendinosus insert on the medial side of the knee.These two muscles aid in the kneeâs slight internal rotation.ther Important Knee Muscles. While the hamstrings and quadriceps are the muscles that cross the knee, they donât act alone. The sartorius aids in flexion and internal rotation of the knee. The gracilis, mainly known for hip adduction, also contributes to flexion. The popliteus serves an especially important function.