Glossary

Glossary of Terms

Acromioclavicular Joint:
A joint at the top of the shoulder. This joint is the articulation of the acromion and the clavicle.
Acromion:
Part of the scapula that forms the highest part of the shoulder.
Articulation:
A fixed or movable joint between bones; a movable joint between inflexible parts of the body.
Atlas:
The first vertebra of the cervical spine. Also referred to as C1.
Axis:
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.
Clavicle:
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.
Extension:
Straightening movement that increases the angle between two body parts. Opposite of Flexion.
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.
Joint:
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.
Scapula:
Shoulder blade.
Sternoclavicular Joint:
The articulation that joins the clavicle, the sternum, and the cartilage of the first rib.
Sternum:
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.
Vertebrae:
Any of the small bones that make up the spinal column.
This is a work in progress and will be updated as needed.