Submandibular and Carotid Triangle

Submandibular Triangle (Digastric Triangle)

Borders of Submandibular triangel

An imaginary topographical triangle for purposes of location of its contents.

Borders:

  • Superior - Inferior borders of the Mandible
  • Anterior - Ant. belly of m. diagastricus
  • Posterior - Post. belly of m. diagasticus
  • Floor - m. mylohyoideus and m. hypoglossus
  • Roof - Investing fascia
Submandibular triangle (borders and contents)

Contents:

  1. Submandibular gland and duct
  2. Facial artery and vein
  3. Lingual artery and vein
  4. Hypoglossal nerve
  5. Submandibular lymph nodes


Carotid Triangle

Borders of Carotid triangle
Borders of the Carotid triangle

Borders:

  • Superior - Post. belly of m. diagastricus
  • Anterior - Sup. belly of m. omohyoideus
  • Posterior - m. sternocleidomastoideus
Carotid triangle (Borders and contents)

Contents:

  1. Internal Jugular vein
  2. Bifurcation of the common carotid artery (at C4)
  3. Deep cervical lymph nodes
  4. Vagus nerve, hypoglossal nerve
  5. Deep sympathetic chain