Glossary of Terms

Acromioclavicular Joint:
A joint at the top of the shoulder. This joint is the articulation of the acromion and the clavicle.
Part of the scapula that forms the highest part of the shoulder.
A fixed or movable joint between bones; a movable joint between inflexible parts of the body.
The first vertebra of the cervical spine. Also referred to as C1.
The second vertebra of the cervical spine. Also referred to as C2.
Baby Boomer:
Generally speaking, Americans born between 1946 and 1964. For our purposes, anyone born during that time, regardless of where, fits into the ‘Baby Boomer’ age demographic.
Ball-and-socket joint:

A joint, such as the shoulder or hip, in which a rounded end of a bone moves within a rounded cavity of another. This type of joint grants the highest degree of range of motion.

More commonly known as the “collar bone”.
Cervical Spine:
7 vertebrae, known as C1-C7, beginning at the base of the skull. These vertebrae allow the head to rotate and bend.
Straightening movement that increases the angle between two body parts. Opposite of Flexion.
Bending movement that decreases the angle between two parts. Opposite of Extension.
Hinge Joint:
A joint, such as the elbow, in which a convex part of one bone fits into a concave part of another, allowing motion in only one plane.
A point of articulation between two or more bones, especially such a connection that allows motion.
Lateral Rotation:
A turning away from the midline of the body. Opposite of Medial Rotation.
Lumbar Spine:
5 vertebrae, known as L1 through L5, located above the base of the spine. Some people have a 6th lumbar vertebrae (L6).
Medial rotation:
A turning towards the midline of the body. Opposite of Lateral Rotation.
Pivot Joint:
A joint, such as the neck, in which a bone rotates around another.
Range of Motion:
Measurement of the extent to which a joint can go through all of its normal spectrum of movements.
Shoulder blade.
Sternoclavicular Joint:
The articulation that joins the clavicle, the sternum, and the cartilage of the first rib.
More commonly known as the “breastbone”.
Synovial Fluid:
A clear fluid secreted by membranes in joint cavities that functions as a lubricant.
Thoracic Spine:
12 vertebrae, T1-T12, located in the chest area. The ribs connect to the thoracic spine.
Any of the small bones that make up the spinal column.
This is a work in progress and will be updated as needed.