Humidity, contact with moisture, and stamps sticking to old album pages and then removed are common examples of disturbed gum. Once again, the amount of original gum left (most refer to +/- 50% of the original gum) on the stamp is a distinction that's made amongst some dealers and collectors.
Description of sciatica. Sciatica describes a collection of symptoms that can arise with sciatic nerve compression. This nerve is the largest and longest in the body, running from the base of the spine and down through both legs. Sciatic nerve compression can lead to pain that begins in the lower back and moves through the buttocks, legs and feet.
There are 5 major regions of the spine: 1  Cervical: The 7 vertebrae in the neck form the cervical region of the spine. 2  Thoracic: The 12 vertebrae in the chest region form the spineâs thoracic region.  Lumbar: The 5 vertebrae in the lower back form the lumbar region of the spine. Lumbar vertebrae are even larger and stronger than thoracic vertebrae, but are more flexible due to the lack of ribs in the lumbar region. All of the upper bodyâs weight bears down on the lumbar vertebrae, leading to many back problems in this region despite the size and strength of the vertebrae.