Anatomy · MU Sofia

Topographic · 240. Submandibular triangle.

Explains where the submandibular triangle sits within the division of the neck by the sternocleidomastoid, then sets out its boundaries: the inferior margin of the mandible, the two bellies of the digastric and the mylohyoid and hyoglossus floor. It lists the contents, including the submandibular gland and duct, lingual and hypoglossal nerves, facial and lingual vessels and lymph nodes. It closes with clinical conditions linked to the area, such as trigeminal neuralgia, Bell's palsy and Ludwig's angina.

Inside: 5 sections · 4 labelled pictures · 16 flashcards · 2 min

Topic 218 of 264 in the MU Sofia syllabus for Anatomy (Dental Medicine, Year 2). The free AceMed note covers it in 4 sections, about 296 words (2 min of reading), with 16 flashcards.

In this note

  1. SUBMANDIBULAR TRIANGLE
  2. Boundaries
  3. Division
  4. Content

SUBMANDIBULAR TRIANGLE

The course of the sternocleidomastoid divides the neck into three regions: anterior cervical region, lateral cervical region and sternocleidomastoid region. These are further divided by the certain cervical muscles into triangles.

Boundaries

  1. 1 Anterior cervical region (regio cervicalis anterior)
  2. 1.1 Cranially: mandible
  3. 1.2 Caudally: sternum – jugular notch
  4. 1.3 Laterally: sternocleidomastoid
  5. 2 Sternocleidomastoid region (regio sternocleidomastoidea) – is bordered by the margins of the sternocleidomastoid
  6. 3 Lateral cervical region (regio cervicalis lateralis)
  7. 3.1 Ventrally: sternocleidomastoid
  8. 3.2 Dorsally: trapezius
  9. 3.3 Caudally: clavicle

Clinical Significans:

  • The submandibular triangle is clinically relevant in several conditions:
  • Trigeminal Neuralgia: This painful condition affecting the trigeminal nerve can sometimes involve the submandibular triangle.
  • Bell’s Palsy: A sudden, temporary weakness or paralysis of the facial muscles due to inflammation of the facial nerve can also manifest in this area.
  • Mandibular Nerve Injury: Trauma or other factors may lead to injury of the mandibular nerve within the submandibular triangle.
  • Ludwig’s Angina: A severe infection involving the floor of the mouth and submandibular space can cause rapid swelling and difficulty breathing 1 3

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