Anterior Triangle of Neck

  1. Stylohyoid
    • Innervation: Facial Nerve [VII]
    • Function: Pulls hyoid bone upward in a posterosuperior direction
  2. Digastric (anterior belly)
    • Innervation: Mylohyoid nerve from inferior alveolar branch of mandibular nerve [V3]
    • Function: opens mouth by lowering mandible, raises hyoid bone
  3. Digastric muscle (posterior belly)
    • Innervation: Facial Nerve [VII]
    • Function: Pulls hyoid bone upward and back
  4. Mylohyoid muscle
    • Innervation: mylohyoid nerve from inferior alveolar branch of mandibular nerve [V3]
    • Function: Support and elevation of floor of mouth, elevation of hyoid
  5. Geniohyoid muscle
    • Innervation: Branch from anterior ramus of C1 (carried by hypoglossal nerve XII)
    • Function: fixed mandible elevates and pulls hyoid bone forward; fixed hyoid pulls mandible downward and inward
  6. Sternohyoid muscle
    • Innervation: anterior rami of C1 to C3 through ansa cervicalis
    • Function: Depresses hyoid bone after swallowing
  7. Omohyoid muscle
    • Innervation: Ant. rami of C1-C3
    • Function: Depresses and fixes hyoid bone
  8. Thyrohyoid muscle
    • Innervation: Fibers from anterior ramus of C1
    • Function: Depresses hyoid bone, but when hyoid is fixed, raises larynx
  9. Sternothyroid muscle
    • Innervation: ant. rami C1-C3
    • Function: draws larynx downward
  10. Thyroid Gland
    • Anterior neck right below the thyroid cartilage
    • Deep to sternohyoid, sternothyroid, and omohyoid muscles
    • Arterial Supply: Superior thyroid artery and inferior thyroid artery (branch of thyrocervical trunk off of the subclavian artery)
    • Venous drainage: Superior thyroid vein and middle and inferior thyroid veins
  11. Multinodular Goiter
    • Most common thyroid pathology
    • Diffuse irregular enlargement of the thyroid gland with areas of thyroid hypertrophy and colloid cyst formation
  12. Submental Triangle
    Contains: submental lymph nodes, tributaries forming anterior jugular vein
  13. Submandibular Triangle
    Submandibular Gland, lymph, hypoglossal nerve, mylohyoid nerve, facial artery and vein
  14. Carotid Triangle
    • Tributaries to the common facial vein
    • Cervical branch of facial nerve
    • common carotid
    • whole bunch of other shit i'm too lazy to write
  15. Muscular Triangle
    Sternohyoid, omohyoid, sternothyroid, thyrohyoid, thyroid and parathyroid glands, pharynx
Author
Mlb8588
ID
239944
Card Set
Anterior Triangle of Neck
Description
Anatomy
Updated