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The annulus fibrosus is the tough outer covering of the intervertebral disc. There is an annulus fibrosus in cervical discs, lumbar discs and in the throacic spine. Learn about the annulus fibrosus.

The nervous system processes both acute and chronic back or neck pain in a number of ways. Just what is allodynia?

Addiction can occur to pain medication just as it can to alcohol and illegal substances. Addiction to pain killers occurs when the person uses the drug for reasons other than how it was intended.

As any medication label will tell you, the active ingredient in a drug is the chemical responsible for the purpose.

Active trigger points are a very common posture problem. Active trigger points causes pain to muscles and may be associated with myofascial pain.

The term agonist as it is used to describe drugs refers to the type of response the drug effects in the human body.

Appendicular Skeleton - The Skeleton of the Extremeties

Analgesics, such as asprin and NSAIDs, work to alleviate pain from acute injury and chronic pain conditions.

Aseptic meningitis is a term relating to spinal meningitis.

Find the definition of acute and how acute pain differs from chronic pain.

Definition of the term autonomic dysreflexia

Defintion of arthritis.

Definition of axial skeleton

Definition of atlantotaxial instability

Definition of ambulatory

Definition of adherence

Definition of the term Activities of Daily Living (ADL).

Find the definition of and resources for the term ankylosing spondylitis.

Axial spondyloarthritis is also called axial spondylitis. Learn more about axial spondyloarthritis and axial spondylitis.

Anterior - a definition.

Definition of anterior pelvic tilt