Figure 6
From: Stereotactic topography of the greater and third occipital nerves and its clinical implication
The depth of emergences of the greater occipital nerve (GON) and third occipital nerve (3ON) from the back muscles. The reference line (a violet line in the right illustration) is established a line from the external occipital protuberance (EOP) to the vertebra prominens (7th cervical vertebra). The blue dots mean the emergences of GON from trapezius (a), semispinalis capitis (b) and occipital capitis inferior (c). The red dots mean the emergences of 3ON from trapezius (d), splenius capitis (e) and semispinalis capitis (f). Each indicating arrow means the depth of the emergence from the reference line. All numbers are presented in millimetre. Mastoid process (lowermost point), MP.
