TRIANGLE OF NECK MAINLY CONTAIN POSTERIOR TRIANGLE, Lecture notes of Anatomy

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IMS MSU

Dr. THAAER MOHAMMED DAHER ALSAAD

SPECIALIST IN GENERAL SURGERY

M.B.Ch.B.(MBBS) F.I.B.M.S.(Ph.D.)

SENIOR LECTURER

TRIANGLES

OF THE

NECK

TRIANGLES OF THE NECK 1/

• Anterolaterally the neck appears as a somewhat

quadrilateral area,

• limited superiorly by the base of the mandible and a line continued from the angle of the mandible to the mastoid process,
• inferiorly by the upper border of the clavicle,
• anteriorly by the anterior median line,
• posteriorly by the anterior margin of trapezius.
• This quadrilateral area can be further divided into

anterior and posterior triangles by sternocleidomastoid, which passes obliquely from the sternum and clavicle to the mastoid process and occipital bone.

The triangles of the left side of the neck

Anterior triangle of the neck

• is bounded anteriorly by the median line of the neck,
• posteriorly by the anterior margin of sterno-cleidomastoid.
• Its base is the inferior border of the mandible
• and its projection to the mastoid process,
• and its apex is at the manubrium sterni.
• It can be subdivided into;
• suprahyoid and infrahyoid areas above and below the hyoid bone,
• and into
• digastric, submental, muscular and carotid triangles by the passage of digastric and omohyoid across the anterior triangle

The triangles of the left side of the neck

Dissection of the left anterior triangle. Platysma has been divided transversely: its upper part has been turned upwards on to the face, and its lower part turned backwards, exposing the lower part of sternocleidomastoid.

• The submandibular lymph nodes are variably related to the submandibular gland.
• The posterior region of the digastric triangle contains the lower part of the parotid gland.
• The external carotid artery,
  • passing deep to stylohyoid,
  • curves above the muscle,
  • and overlaps its superficial surface as it ascends deep to the parotid gland before entering it.  The internal carotid artery, internal jugular vein and vagus nerve lie deeper and are separated from the external carotid artery by  styloglossus, stylopharyngeus and the glossopharyngeal nerve.

DIGASTRIC TRIANGLE 2/

The triangles of the left side of the neck

The triangles of the left side of the neck