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.
Cervical. The first seven vertebrae, all in the neck. These are smaller and lightly built. Thoracic. Twelve vertebrae, each articulating with the twelve pairs of ribs. Lumbar. The lower five vertebrae, between the ribs and the sacrum.These have the largest vertebral bodies. Each of the three segments of the spine has a curve. The cervical spine and the lumbar curve both are convex anteriorly, while the thoracic spine curves the opposite way, convex posteriorly.Each vertebra is shaped a bit like a wedge to support these curves, especially noticeable with the five lumbar vertebrae.he first seven vertebrae, all in the neck. These are smaller and lightly built. Thoracic. Twelve vertebrae, each articulating with the twelve pairs of ribs. Lumbar. The lower five vertebrae, between the ribs and the sacrum.