Itching can be diffuse (generalized all over the body) or localized -- all over or confined to a specific spot -- and there are many causes of diffuse and localized itching. Itching symptoms can be associated with. 1  rash,  dry skin,
How are the Sacrum and Coccyx different from the other vertebrae? The sacrum consists of 5 fused sacral vertebrae and the coccyx consists of 4 fused coccygeal vertebrae. They are different because the are not moveable.
Sacrum: The sacrum is the wedge-shaped bone consisting of five fused vertebrae, the first of which has a prominent upper border known as the sacral promontory. This is an important pelvic landmark. It projects forward decreasing the anterposterior diameter of the pelvic brim. If this diameter is seriously decreased it can impair the descent of the fetal head into the pelvis. The smooth concave anterior surface is referred to as the hollow of the sacrum and the areas either side are the alae or wings. The convex posterior surface is roughened to receive attachments of muscles. The sacrum is perforated by four sets of holes or foramina through which the sacral nerves pass. Coccyx: The coccyx is at the lower part of the spine and is a vesitigal tail. It is a small triangular-shaped bone consisting of four fused vertebrae.