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Fig. 40-3. The suboccipital triangle. Most of the semispinalis capitis has been removed. Note the greater occipital nerve emerging at the lower border of the inferior oblique muscle. The vertebral artery and the suboccipital nerve are seen in the triangle. The massive suboccipital venous plexus has been omitted. On the left side, lines indicate the directions and attachments of the muscles that bound the triangle. Click for high resolution image.