<prompt> True regarding surface anatomy of internal jugular veinLine passing from ear lobule to mid pt of clavicleLine passing from ear lobule to medial end of clavicleLine joining ear lobule to lateral end of clavicleLine joining mastoid process to mid pt of clavicle  <response>: Internal jugular vein is marked by a broad line by joining these two points: The first point on the neck medial to the lobule of the ear The second point at the medial end of the clavicle Ref BDC volume 3,Sixth edition pg 303 