1. Sonographic visualization and ultrasound-guided blockade of the greater occipital nerve: a comparison of two selective techniques confirmed by anatomical dissection 
M. Greher, B. Moriggl, M. Curatolo, L. Kirchmair, U. Eichenberger 
British Journal of Anaesthesia 
Volume 104, Issue 5, Pages (May 2010)
DOI: /bja/aeq052
Copyright © 2010 The Author(s) Terms and Conditions

2. Fig 1
Transducer positions for ultrasound-guided blocks of the GON. 1, Classic block site at the superior nuchal line; 2, new block site at C2.
British Journal of Anaesthesia  , DOI: ( /bja/aeq052)
Copyright © 2010 The Author(s) Terms and Conditions

3. Fig 2
Schematic drawing of the course of the GON. 1, Classic block site medial to the occipital artery at the superior nuchal line; 2, new block site over the obliquus capitis inferior muscle (grey) at C2.
British Journal of Anaesthesia  , DOI: ( /bja/aeq052)
Copyright © 2010 The Author(s) Terms and Conditions

4. Fig 3
Ultrasound image obtained by the transducer position 2 in Figure 1. 1, Obliquus capitis inferior muscle; BONE, lamina of C2; GON, greater occipital nerve.
British Journal of Anaesthesia  , DOI: ( /bja/aeq052)
Copyright © 2010 The Author(s) Terms and Conditions

5. Fig 4
The anatomical dissection shows four injection sites. The upper two are at the classical block site at position 1 in Figure 2. The lower two are at the new block site at position 2 in Figure 2. The tips of all four needles are in the GON, and the nerve is coloured by ICG.
British Journal of Anaesthesia  , DOI: ( /bja/aeq052)
Copyright © 2010 The Author(s) Terms and Conditions

6. Fig 5
Ultrasound image in a living subject according to transducer position 2 in Figure 1. 1, Obliquus capitis inferior muscle; BONE, lamina of C2; GON, greater occipital nerve; VA, vertebral artery with Doppler signal inside.
British Journal of Anaesthesia  , DOI: ( /bja/aeq052)
Copyright © 2010 The Author(s) Terms and Conditions