Regional Anatomy - Triangles of the Neck

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1. 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
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2. Main contents of the carotid triangle

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

3. Borders of the occipital triangle

  • Anterior- trapezius, Posterior- omohyoideus, inferior- sternocleidmastoid, floor- splenius capitis, levator scapulae and scalene medius and posterior
  • Anterior- sternocleidomastoid, Posterior- trapezius, inferior- omohyoideus, floor- splines captious, elevator scapulae and scalene medium and posterior
  • Anterior- omohyoidues, Posterior- sternocleidomastoid, inferior- trapezius, floor- splenius capitis, levator scapulae and scalene medius and posterior

4. Borders of the posterior triangle

  • Anterior- posterior border of the sternocleidomastoid, Posterior- anterior portion of the sternocleidomastoid, inferior- the first third of the clavicle
  • Anterior- Posterior border of the sternocleidomastoid, Posterior- Anterior border of the trapezius muscle, Inferior- middle 3rd of the clavicle
  • Anterior- Anterior border of the sternocleidomastoid, Posterior- posterior border of the sternocleidomastoid, Inferior- middle 3rd of the clavicle

5. Borders of the Subclavian triangle

  • 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
  • Superior- posterior border of the sternocleidomastoid, Inferior- inferior belly of the omohyoid, base- clavicle, floor- 1st rib

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