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triangles of neck

  • Anatomists use the term triangles of the neck to describe the divisions created by the major muscles in the region.
  • The side of the neck presents a somewhat quadrilateral outline, limited, above, by the lower border of the body of the mandible, and an imaginary line extending from the angle of the mandible to the mastoid process; below, by the upper border of the clavicle; in front, by the middle line of the neck; behind, by the anterior margin of the Trapezius.


  • It between the posterior and anterior bellies of the digastric muscle and inferior border of the mandible. Its floor is formed by the mylohyoid, hyoglossus and middle constrictor muscles.
  • Continuous with the fossa for the parotid gland
  • Mylohyoid muscle lies superior to the anterior belly of the digastric
    • Forms a sling passing from side to side from its attachment to the internal surface of the mandible (mylohyoid line)

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