Condenser Diaphragm-This diaphragm controls the amount of light entering the lens system. This feature is useful for viewing unstained biological specimens that are translucent. Reducing the amount of light improves contrast, making the specimen stand out against the background.
Sciatica occurs when the sciatic nerve is pinched, irritated or injured. Inflammation, arthritis or a displaced disk in the lower spine are often to blame. Doctors commonly treat sciatica with epidural injections into the spine.(The word âepiduralâ refers to a particular area in the spine.) The injections contain a steroid, which reduces inflammation. The injections can also contain a long-lasting painkiller.The different causes of sciatica may be one reason that studies come to different conclusions.The word âepiduralâ refers to a particular area in the spine.) The injections contain a steroid, which reduces inflammation. The injections can also contain a long-lasting painkiller. The different causes of sciatica may be one reason that studies come to different conclusions.
Exercises for specific sciatica conditions. Watch: Back Exercise Videos. The specific sciatica exercises will depend on the underlying medical condition causing the sciatica pain, as well as a number of other factors, such as the patient's level of pain and overall conditioning. For information and illustrations on exercises for different causes of sciatica, see: 1  Exercise for Sciatica from a Herniated Disc. 2  Exercise for Sciatica from Spinal Stenosis. 3  Exercise for Sciatica from Degenerative Disc Disease.