下列那一條神經出現在枕下三角內(suboccipital triangle)?
枕下神經(suboccipital nerve)
枕大神經(greater occipital nerve)
枕小神經(lesser occipital nerve)
第三枕神經(\mathrm{3}^{\mathrm{rd}} occipital nerve)
\mathrm{3}^{\mathrm{rd}}