Regional Anatomy - Triangles of the Neck

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1. 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
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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. 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 submandibular triangle

  • Superior- posterior belly of the digastric muscle, Anterior-body of the mandible, Superior- anterior belly of the digastric muscle
  • Superior- body of the mandible, Anterior- anterior belly of the digastric muscle, Posterior- posterior belly of the digastric muscle
  • Superior- anterior belly of the digastric muscle, Anterior- body of mandible, Posterior- posterior belly of the digastric muscle

5. Contents of the submandibular triangle

  • contains: submandibular gland (salivary) and lymph nodes, facial artery and vein also pass through
  • Contains: submandibular gland (salivary) and lymph nodes, common carotid artery and vein
  • Contains: submandibular gland (salivary) and lymph nodes, facial nerve

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