Anterior triangle of the neck

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The anterior triangle of the neck is the front part of the neck. Its apex points downward toward the chest, and its base is under the chin. The roof is formed by investing fascia and the floor by visceral fascia.

Key muscles and nerves in this area:
- Suprahyoid muscles (near the jaw): digastric (two bellies), stylohyoid, mylohyoid, and geniohyoid.
- Digastric: the posterior belly is near the facial nerve; the anterior belly and the mylohyoid get nerves from the mandibular nerve (V3). The mylohyoid nerve comes from V3.
- Geniohyoid: supplied by C1 fibers carried with the hypoglossal nerve.
- Infrahyoid muscles (in the floor): sternohyoid, omohyoid, sternothyroid, and thyrohyoid.
- Sternohyoid, omohyoid, and sternothyroid are mainly supplied by the ansa cervicalis.
- Thyrohyoid is supplied by a branch from the hypoglossal nerve carrying C1 fibers.

The anterior triangle is divided into four smaller triangles by the digastric muscles (anterior and posterior bellies) and the superior belly of the omohyoid:
- Submental triangle
- Submandibular triangle
- Carotid triangle
- Muscular triangle