Anterior triangle of the neck
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|Anterior triangle of the neck|
Side of neck, showing chief surface markings. (Nerves are yellow, arteries are red.)
|Latin||Trigonum cervicale anterius; Trigonum colli anterius|
The anterior triangle is a region of the neck.
The triangle is inverted with its apex inferior to its base which is under the chin.
|Inferior boundary (apex)||Jugular notch in the manubrium of the sternum|
|Anterior boundary||Midline of the neck from chin to the jugular notch|
|Posterior boundary||The anterior margin of Sternocleidomastoid|
|Superior boundary (base)||The lower border of the body of the mandible, and a line extending from the angle of the mandible to the mastoid process|
- Suprahyoid muscles - Digastric (Ant and Post Belly), mylohyoid, geniohyoid and Stylohyoid.
- Infrahyoid muscles - Omohyoid, Sternohyoid, Sternothyroid, and Thyrohyoid.
2 Bellies of Digastric
Stylohyoid: by the facial nerve, by a branch from that to the posterior belly of digastric.
Mylohyoid: by its own nerve, a branch of the inferior alveolar ( from the mandibular division of trigemminal nerve), which arises just before the parent nerve enters the mandibular foramen, pierces the sphenomandibular ligament, and runs forward on the inferior surface of the mylohyoid, supplying it and the anterior belly of the digastric.
Geniohyoid: by a branch from the hypoglossal nerve consisting of fibres from the C1 nerve.
Sternohyoid, Omohyoid, Sternothyroid are supplied by Ansa cervicalis.
Thyrohyoid: by a branch of hypoglossal nerve but the fibres are all 'hitch-hiking' from C1.
These smaller triangles are named: