What are the two functional columns of the spine?
Anterior Segment and Posterior Segment
What is the function of the Anterior Segment of the spine?
Support, weight-bearing, and shock absorption
What structures are included in the Posterior Segment of the spine?
Vertebral arches, facets, transverse processes, and spinous process
What is the key role of the Posterior Segment of the spine?
To guide and limit motion
Define the Vertebral Unit.
Two adjacent vertebrae with their associated intervertebral disk, arthrodial, ligamentous, muscular, vascular, lymphatic and neural elements
How is vertebral motion named according to osteopathic nomenclature?
Based on the movement of the anterior superior surface of the vertebral body relative to the vertebra below it
What is flexion in terms of vertebral motion?
Forward bending in the sagittal plane
What is extension in terms of vertebral motion?
Backward bending in the sagittal plane
What does sidebending refer to in vertebral motion?
Movement in the coronal (frontal) plane
If a vertebra sidebends left, what happens to the transverse processes?
Left TPs come closer together, right TPs separate
What is rotation in terms of vertebral motion?
Movement around a vertical axis
In the clinical example, if T3 is rotated right, what happens to its spinous process?
Moves left
What is the thoracic spine ‘Rule of Threes’?
A guideline for locating TPs in the thoracic spine
What is the relationship between SP and TP for T1-T3 and T12?
SP is level with the TP of the same vertebra
What is the relationship between SP and TP for T4-T6 and T11?
SP is a half step below the corresponding TP
What is the relationship between SP and TP for T7-T9 and T10?
SP is a full step below the corresponding TP
If your finger is on the T8 spinous process and you move laterally, what structure are you palpating?
Transverse process of T9
What is the name associated with the principles of physiologic spinal motion?
Fryette
Which regions of the spine do Fryette’s principles apply to?
Thoracic and lumbar spine
What is the First Principle of Fryette’s Mechanics also known as?
Neutral Mechanics
What occurs in the T/L spine during the First Principle when in a neutral position?
Sidebending and rotation occur in OPPOSITE directions
The First Principle typically applies to what?
A group of vertebrae (a group curve)
What happens to the vertebral bodies in the First Principle?
They rotate toward the convexity of the curve
What is the Second Principle of Fryette’s Mechanics also known as?
Non-Neutral Mechanics