This refers to a coil of wire which can contain a current that is in a loop.

Identify the feature highlighted in red.   

Identify the bone seen at #3.  

Identify the feature of the mandible indicated with the red circle.   

Identify the suture. 

Identify the structure seen at the X.  

Identify the bone highlighted in green.

Identify the structure seen at the X.   

Identify the structure highlighted in red. 

Identify the bone seen at #3.