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The 4 Layers of the Neck Extensors 💡 👉 The neck extensors are organized in four layers (https://t.co/QLrIzylMwy , https://t.co/qTa9kv4skm) (Fig. 1: https://t.co/ldODGE411j). 1️⃣ Levator scapulae and upper trapezius constitute the superficial layer… http