Fig. 2. Relevant landmark for locating the needle entry using a landmark technique. The same point could be marked prior to performing an ultrasound scan also (Modified from http://resizeandsave.online/openphoto.php? img=http://images.fineartamerica.com/images-medium-large-5/anatomy-of-human-skull-rear-view-leonello-calvetti.jpg). The figure has been labelled at appropriate places.
