Anterior triangle of the neck - banks

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. its the muscular entity?
2. Carotid Δ - whole lesson on this, come back to it. this is where u get ur external carotid arteries
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. when u think hard, u stroke chin, its the mental area.
   - bounded by ant. digastric bellies and body of hyoid bone

Question 3

extensive cutaneous area of anterior triangle is afforded by the transverse cervical nerve

Question 4

anterior branch of retromandibular vein joins up with facial vein, also anterior jugular veins are here too.

Question 5

external jugular on top of scm, anterior jugular between scm, internal jugular deep, behind to scm.

Question 6

Contents: Muscles:

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

Answer 6

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

Question 7

Target for MC questions: odd one out:
Which nerves supply the infrahyoid muscles:

Answer 7

Anterior rami of C1, C2, C3 via cervical plexus and its ansa cervicalis (loop). this innervates Omohyoid, sternohyoid, sternothyroid.

*Thyrohyoid is innervated from C1 via CN XII

Question 8

Contents: Muscles:

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

Answer 8

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

Question 9

Innervation of the suprahyoid muscles:

Answer 9

post. digastric / stylohyoid = cervical branch of facial.
ant. digastric / mylohyoid = mylohyoid nerve, branch of CN V (7 and 5)
ODD ONE OUT: geniohyoid = C1 nerve. travels with hypoglossal nerve.