Anterior Triangle of the Neck

Question 1

Boundaries of the Anterior Triangle:

Answer 1

*Anterior boundary : median line of the neck
*Posterior boundary : anterior border of the sternocleidomastoid muscle
*Superior boundary (base) : inferior border of the mandible

Question 2

B. Subdivisions of the anterior triangle:

*For more precise localization of structures, the anterior cervical region is subdivided into four smaller triangles:

Answer 2

1. Muscular Δ - anterior aspect below the hyoid bone
   - contains the infrahyoid strap muscles
2. Carotid Δ - between sup. omohyoid , post. digastric and SCM
   - contains brs. of external carotid a. and CN X, XI, XII
3. Submandibular Δ - between mandible and digastric bellies
   - contains submandibular salivary gland, lingual and facial aa., CN XII
4. Submental Δ - a midline structure below the chin
   - bounded by ant. digastric bellies and body of hyoid bone

Question 3

Contents: Muscles:

Infrahyoid muscles: Made of 2 superficial and 2 deeper muscles:

Answer 3

• two superficial muscles:
  1. Omohyoid & 2. Sternohyoid
• two deeper muscles:
  3. Sternothyroid & 4. Thyrohyoid

Question 4

Contents: Muscles:

*Suprahyoid Muscles: 5 pairs of muscles originate above the hyoid bone.

Answer 4

1.) Posterior digastric
2.) Anterior Digastric
3.) Mylohyoid
4.) Geniohyoid:
5.) Stylohyoid: