FRONT OF NECK

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BORDERS:
- - Superior - inferior border of mandible
- - Medial - midline of neck
- - Lateral - anterior border of sternocleidomastoid muscle
CONTENTS
- Muscles:
  - thyrohyoid, sternothyroid, sternohyoid muscles
- Organs:
  - thyroid gland, parathyroid glands, larynx, trachea, esophagus, submandibular gland, caudal part of the parotid gland
- Arteries:
  - superior and inferior thyroid, common carotid, external carotid, internal carotid artery (and sinus), facial, submental, lingual arteries
- Veins:
  - anterior jugular veins, internal jugular, common facial, lingual, superior thyroid, middle thyroid veins, facial vein, submental vein, lingual veins
- Nerves:
  - vagus nerve (CN X), hypoglossal nerve (CN XII), part of sympathetic trunk, mylohyoid nerve
Subdivisions:
- - Muscular (omotracheal) triangle
  - Borders
    - Superior - hyoid bone
    - Lateral - superior belly of omohyoid and anterior border of sternocleidomastoid
    - Medial - midline of neck
  - Contents
    - Muscles: thyrohyoid, sternothyroid, sternohyoid
    - Vessels: superior and inferior thyroid arteries, anterior jugular veins
    - Viscera: thyroid gland, parathyroid glands, larynx, trachea, esophagus
- - Carotid triangle
  - Borders
    - Anterior - superior belly of omohyoid muscle
    - Superior - stylohyoid and posterior belly of digastric muscles
    - Posterior - anterior border of sternocleidomastoid muscle
  - Contents
    - Arteries: common carotid, external carotid (and branches except maxillary, superficial temporal and posterior auricular), internal carotid artery (and sinus)
    - Veins: internal jugular, common facial, lingual, superior thyroid, middle thyroid veins
    - Nerves: vagus nerve (CN X), hypoglossal nerve (CN XII), part of sympathetic trunk
- - Submandibular triangle
  - Borders
    - Superior - inferior border of mandible
    - Lateral - anterior belly of digastric muscle
    - Medial - posterior belly of digastric muscle
  - Contents
    - Viscera: submandibular gland and lymph nodes (anteriorly), caudal part of the parotid gland (posteriorly)
    - Vessels: facial artery and vein, submental artery and vein, lingual arteries and veins
    - Nerves: mylohyoid, hypoglossal (CN XII)
- - Submental triangle
  - Borders
    - Inferior - hyoid bone
    - Lateral - anterior belly of digastric muscle
    - Medial - midline of neck
  - Contents
    - Anterior jugular vein, submental lymph nodes