The mylohyoid muscle is formed by two units, left and right. The anterior bellies of the digastric muscle, which attach to the digastric fossa, separate the submental from the submandibular triangle. The submental triangle harbors the submental lymph nodes that drain the mental region, the tip of the tongue, inferior lip, and incisor teeth. Also, the mylohyoid nerve and veins that drain into the anterior jugular vein traverse this region. They insert to the mylohyoid line of the mandible and run medially and downward to attach to the body of the hyoid bone.
Furthermore, the left and right mylohyoid muscles constitute the floor. The apex of the triangle is the chin, the base is the body of the hyoid bone, and the sides are formed by the anterior bellies of the digastric muscle. The submental triangle situates within this region and is differentiated from the other triangles because it is unpaired. The boundaries of the anterior cervical triangle include the anterior margin of the sternocleidomastoid muscle, the midline of the neck, and the inferior border of the mandible. The neck also harbors the vertebral artery and scalene triangles in its deep layers, and Lesser's, Pirogov's, Farabeuf's, and Béclard's triangles. The posterior triangle is divided into an occipital and a supraclavicular triangle the anterior triangle contains three paired triangles (muscular, carotid, and submandibular) and one unpaired space: the submental triangle.
Two main cervical triangles are described between these limits, anterior and posterior. The neck is anatomically bounded by the inferior border of the mandible, the superior border of the clavicle, the midline, and the anterior border of the trapezius muscle.
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