Anatomy
The Vertebral Spine
The spine travels from the skull to the pelvis. In a normal spine it has three curves, an inwards curve in the neck (cervical spine) called Lordosis, an outwards curve in the mid back (thoracic spine) called Kyphosis and an inward curve again in the low back (lumbar spine) called Lordosis.
For an optimal spine these segments should be balanced, known as a neutral spine.
Bones and Joints
Each individual bone of the spine is called a Vertebra with bony protrusions called processes, these act like levers for the muscles. The top and bottom of each vertebra has an End Plate allowing for diffusion of nutrients to the Disc.
Attached to the vertebra are the two Facet joints surrounded by its capsule, these guide the movements of the vertebra adding support and stability during movements.
Discs
Between each vertebra there is a Disc it provides some space between the vertebra allowing some cushioning and a degree of bending.
The outside rings are made of tough collagen tissue, while the inside is called the Nucleus made of a gel like substance that helps distribute the load throughout the disc.
The disc may increase 1-3 millimeters in height, because of fluid dynamics in horizontal position during the night.
Spinal Nerves
The spinal cord travels from the brain down the spinal cord, with nerves exiting at each spinal level.
Damage to the spine or disc can damage or irritate the nerve leading to a variety of symptoms including pain.
Sciatica: refers to pain that originates from the lumbar plexus (L4-S1) of the lower back, and is felt into the buttocks and along the back or side of the leg.
Muscles
The ligaments and muscles manage the integrity and movement of vertebral.
Muscles manage the motions and postures of the spine. They can act like guywires helping us control the various movements and shear forces applied to the vertebra of the spine.