A cluster of nerve cells that acts like a junction box, allowing nerves to communicate and coordinate actions in your body.
From Greek 'ganglion' originally meaning a knot or tumor-like swelling, observed in ancient times as lumps along nerve pathways. Over time, the term came to refer specifically to the nerve clusters themselves rather than the swelling.
Your body has hundreds of ganglia operating like relay stations—they let your hand pull away from a hot stove before your brain even realizes it's hot! This is why ganglia are sometimes called 'local command centers' that don't need to wait for your brain's permission.
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