It is located in the head, usually close to the primary sensory organs for such senses as vision, hearing, balance, taste, and smell.

The primary organs of power in the Communist Party include:

That's the primary organ involved in the cinema experience.'

At this point the T cells leave the primary lymphoid organ and enter the blood stream.

The primary organ responsible for regulating metabolism is the hypothalamus.

Leaves are the primary photosynthetic organs of a plant.

The primary organ that is closely related to smoking are the lungs.

The lungs are the primary organ affected, but other systems can be involved.

In humans, the liver is the primary organ of copper-induced toxicity.