The multifidus muscle attaches to the mammillary process and this muscle extends through the length of the vertebral column, giving support.
On either side of the middle sacral crest is a shallow sacral groove, which gives origin to the multifidus muscle.
The problem with the multifidus muscles continues even after the pain goes away, and is probably an important reason why the pain comes back.
The upper three are covered at their points of exit by the multifidus and divide into medial and lateral branches.
The multifidus is a very thin muscle.
