DNA (deoxyribonucleic acid) The molecule that carries genetic information in all living systems (see genetic code). The DNA molecule is formed in the shape of a double helix from a great number of smaller molecules (see nucleotides). The workings of the DNA molecule provide the most fundamental explanation of the laws of genetics.
Getting an epidural. Watch one mom in labor get an epidural for pain relief. The medication is usually a combination of a local anesthetic and a narcotic. Local anesthetics block sensations of pain, touch, movement, and temperature, and narcotics blunt pain without affecting your ability to move your legs.
An epidural injection is one of many methods doctors use to relieve pain, along with physical therapy, oral medications and surgery if a patient is not responding to conservative treatments. An epidural injection may be performed to alleviate pain caused by: 1  A herniated or bulging disk that impinges nerves causing pain. 2  Spinal stenosis. 3  Post-operative failed back surgery syndromes (chronic back or leg pain after spinal surgery) 4  Other injuries to spinal nerves, vertebrae and surrounding tissues. 5  Bone spurs.