Regional Anatomy - Triangles of the Neck

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1. Borders of the Muscular triangle

  • Superior- imaginary midline of the neck, Medial- hyoid bone, Superolateral- superior belly of the omohyoid muscle, infer-lateral- inferior portion of the sternocleidomastoid muscle
  • 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
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2. Contents of the Muscular triangle

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

3. Main content of the submental triangle

  • 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
  • parotid lymph nodes --> filter lymph draining from floor of the mouth and parts of the tongue

4. Borders of the Subclavian triangle

  • Superior- posterior border of the sternocleidomastoid, Inferior- inferior belly of the omohyoid, base- clavicle, floor- 1st rib
  • Superior- the inferior belly of the omohyoid, inferior-clavicle, base- posterior border of the sternocleidomastoid, floor- formed by 1st rib with digitation of the serratus anterior
  • Superior- Posterior border of the sternocleidomastoid, inferior- 1st rib, Base- inferior belly of the omohyoid, floor- clavicle

5. 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)

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