A large network of nerves called the brachial plexus starts from the spinal nerve roots and lies under the collarbone. The branches of these nerves travel along the humerus down the arm to provide ...

The lumbosacral joint, also called L5-S1, is a term used to describe a part of the spine. L5-S1 is the exact spot where the lumbar spine ends and the sacral spine begins. The lumbosacral joint ...