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The Functional Unit

The vertebral motion segment

Regional Biomechanics

How each spinal region moves

The neutral zone and the physics of a 'crack'

Why Manipulation Has Effects

Mechanoreceptors and the neurophysiology of manipulation

Checkpoint: structure and mechanics

You cannot manipulate what you don't understand. This module builds the structural and mechanical foundation underneath every adjustment: the motion segment as the spine's functional unit, how each region moves, the physics of the neutral zone, and the neurophysiology that explains why a thrust changes how a patient feels and moves.

Spinal Anatomy & Joint Biomechanics

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