A derecho (/dÉËreÉªtÊoÊ/, from Spanish: derecho [deËÉ¾etÊo], straight) is a widespread, long-lived, straight-line wind storm that is associated with a land-based, fast-moving group of severe thunderstorms. Derechos can cause hurricane-force winds, tornadoes, heavy rains, and flash floods.
In human anatomy, a hamstring is one of the three posterior thigh muscles in between the hip and the knee. In quadrupeds, the hamstring is the single large tendon found behind the knee or comparable area.
Hamstring injury facts. 1  Hamstrings are tendons of the muscles of the back of the thigh. 2  Hamstring muscles bend the knee and straighten the hip. 3  Hamstring muscle injury is a common athletic injury. 4  Most hamstring muscle and tendon injuries heal without surgery.amstring injury facts. 1  Hamstrings are tendons of the muscles of the back of the thigh. 2  Hamstring muscles bend the knee and straighten the hip. 3  Hamstring muscle injury is a common athletic injury. 4  Most hamstring muscle and tendon injuries heal without surgery.