Fig. 2

Ultrasound image of greater occipital nerve anatomy. Anatomy of the greater occipital nerve as illustrated by ultrasound transverse plane at level of C2 (live image). 1: Obliqus capitis muscle, 2: semispinalis capitis muscle, 3: splenius capitis muscle, white arrow: the lamina of C2, orange arrow: the fascia containing the GON and artery (target point)