The document describes the anatomy of structures in the submandibular region of the neck, including muscles, salivary glands, nerves and vessels. It discusses the digastric muscle, mylohyoid muscle, stylohyoid muscle, geniohyoid muscle, genioglossus muscle, hyoglossus muscle, submandibular gland, sublingual gland and lingual nerve. Relationships between these structures are defined, along with origins, insertions, nerve supply and actions of the muscles.