True regarding surface anatomy of internal jugularvein -

Ans 'b' i.e., Line passing from ear lobule to medial end of clavicle SURFACE MARKINGS OF IMPORL4N VESSELS OF NECKSurface anatomy of internal jugular vein:o Internal jugular vein is marked by a line joining a point on the neck, medial to the ear lobule to a point at the medial end of the clavicle.Surface anatomy of the external jugular vein:o Marked by a line joining a point a little below and behind the angle of the mandible to a point on the clavicle just lateral to the posterior border of the stemocleidonastoid.Subclavian vein:o Marked by a line joining the medial end of the bone to its midpoint.Common carotid artery:o Marked by a line joining a point on the stemovlavicular joint to a point on the anterior border of the sternocleidomastoid at the level of upper border of the thyrroid cartilage.Internal carotid artery :o Marked by a line joining a point on the anterior border of the stemocleidommastoid at the level of upper border of thyroid cartilage to a point on the posterior border of the condyle of the mandible.External carotid artery:o Marked by a line joining a point on the anterior border of the stemocleidommastoid at the level of upper border of thyroid cartilage to a point on the posterior border of the neck of the mandible.