After the stratosphere come the mesosphere and thermosphere. First is the mesosphere, which extends upward to 50 miles above the surface. After the mesosphere, we have our layer thermosphere, which extends from about 50 miles above the surface of Earth to about 600 miles above our planet. Beyond that is the exosphere, which is the layer that turns into outer space at the edge. What Do We Know About the Mesosphere?
Calf and hamstring pain can be caused by sciatica, a condition in which your sciatic nerve is irritated. A pulled hamstring muscle near your knee joint or a pulled calf muscle near the knee induces pain. The bursas lubricating and cushioning your knee joint and the pelvic attachment of your hamstring muscle can become irritated and swollen, causing pain.
What causes calf pain? Calf pain or calf muscle pain can occur from a number of causes. Calf strain is probably the most common cause of calf pain or pain at the back of the lower leg. However there are a number of other potential causes of calf pain which we outline below. We outline the most common causes of calf pain as well as some of the less common calf injuries.