The ability to sense joint position and movement, also called proprioception in the joints.
From Greek 'arthron' (joint) + 'aisthesis' (sensation or perception). This term emerged in physiology to describe the sensory awareness that allows you to know where your joints are without looking.
Your joints have their own 'sixth sense'—special sensors that tell your brain exactly where your knees, elbows, and fingers are positioned, even with your eyes closed, and this word names that invisible superpower.
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