Primary displacement vs Secondary displacement

# The movement of bone in response to its own growth is termed as:
a) Rotation
b) Secondary displacement
c) Primary displacement
d) Differentiation

The correct answer is C. Primary displacement.

Types of Bone Growth:
Drift: 
Combinations of deposition and resorption occurring in different bones of skull resulting in growth movement towards depositary surface.

Displacement:
• It is the movement of whole bone as a unit.
• In primary displacement, the bone is displaced as a result of its own growth.
• In secondary displacement, the bone gets displaced as a result of growth and enlargement of adjacent bone.

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