Regional Anatomy - Triangles of the Neck

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1. Main content of the submental triangle

  • parotid lymph nodes --> filter lymph draining from floor of the mouth and parts of the tongue
  • Submental lymph nodes --> filter lymph draining from floor of mouth and parts of tongue
  • digastric lymph nodes --> filter lymph draining from floor of mouth and parts of tongue
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2. Borders of the Anterior triangle

  • Superior- Inferior border of the mandible (jawbone), Lateral- medial border of the sternocleidomastoid, medial- imaginary sagittal line down the midlineof body
  • Superior - imaginary sagittal line down midline of body, lateral- medial border of the sternocleidmastoid, medial- inferior border of the mandible
  • Superior- medial border of the sternocleidmastoid, Lateral- imaginary sagittal line down the midline of the body, medial- inferior border of the mandible (jawbone)

3. Contents of the Muscular triangle

  • Contains: no vessels, infrahyoid muscles, the pharynx, the thyroid and parathyroid
  • contains: no vessels, Suprahyoid muscles, the larynx, the thyroid and parathyroid
  • Contains: blood vessels, infrahyoid muscles, the pharynx, the thyroid and parathyroid

4. Main contents of the carotid triangle

  • common carotid artery, internal jugular vein and the hypoglossal (XII) & Vagus (X) nerves
  • carotid artery, external jugular vein and optic (II) & Oculomotor (III) nerves
  • vertebral artery, internal jugular vein and hypoglossal (XII) & glossopharyngeal (IX) nerves

5. Borders of the Muscular triangle

  • Superior- hyoid bone, Medial- imaginary midline of the neck, Supero-lateral- superior belly of the omohyoid muscle, Infero-lateral- inferior portion of the sternocleidomastoid muscle
  • Superior- superior belly of the omohyoid muscle, medial- imaginary midline of the neck, Supero-lateral- hyoid bone, infer-lateral inferior portion of the sternocleidomastoid muscle
  • Superior- imaginary midline of the neck, Medial- hyoid bone, Superolateral- superior belly of the omohyoid muscle, infer-lateral- inferior portion of the sternocleidomastoid muscle

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