The os trigonum is an extra bone that sometimes develops behind the ankle. It does not always cause symptoms but can cause pain due to irritation and inflammation. Doctors call this os trigonum ...
A dermatome is an area of skin supplied by a single spinal nerve. There are 31 pairs of spinal nerves, forming nerve roots that branch from your spinal cord, but only 30 dermatomes. Your spinal nerves ...
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