This figure shows a cross section of a vertebra and the spinal cord.What structure does number 1 indicate? 
Definitions:
Neutrophils
A type of white blood cell, part of the body's immune system, playing a key role in defending the body against bacterial and fungal infections through phagocytosis.
Muscle Strength
The maximal force generated by a muscle or muscle group under specific conditions.
Thrombus
Clot in the cardiovascular system formed from constituents of blood; may be occlusive or attached to the vessel or heart wall without obstructing the lumen.
Embolus
Plug, composed of a detached clot, a mass of bacteria, or another foreign body, occluding a blood vessel.
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