Figure 4
From: Stereotactic topography of the greater and third occipital nerves and its clinical implication
The position of greater occipital nerve (GON) and third occipital nerve (3ON) in cadaveric observation (left illustration) and the corresponding ultrasound images (right images). Upper red line runs through the emergence of GON from the trapezius (TP) and lower one through the spinous process of the axis (C2). Each ultrasound images and their illustrations corresponds to sections through upper and lower red lines respectively. sternocleidomastoid muscle, SCM; splenius capitis, SpC; semispinalis capitis, SSC; obliquus capitis inferior, OCI.
