Relating to both the ribs and the clavicle (collarbone), particularly referring to the space or ligament between these structures.
From Latin 'costa' (rib) combined with 'clavicular' from Latin 'clavicula' (little key, collarbone). The clavicle got its name because Romans thought it resembled a key. This anatomical term describes one of the body's important structural passageways.
The costoclavicular space is like a gateway in the shoulder—if it gets too narrow from poor posture or injury, it can squeeze nerves and blood vessels causing thoracic outlet syndrome, which is why your posture literally affects whether your arm falls asleep.
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