neck triangles

Question 1

omotrapezius (occipital) triangle

Answer 1

borders - trapezius, sternocleidomastoid, inferior belly of omohyoid.

contents:
- external jugular vein
- CN 11 - accessory
- cervical plexus
- transverse cervical artery+veins

Question 2

omoclavicular (subclavian) triangle

Answer 2

borders - inferior belly of omohyoid, clavicle, sternocleidomastoid.

contents:

• 3 trunks of brachial plexus ( lateral psterior medial)
• subclavian artery+vein
• supraclavicular lymph nodes
• suprascapular artery
• transverse cervical artery+vein
• deep cervical artery+vein

Question 3

submental triangle

Answer 3

borders- hyoid bone, anterior belly of digastric muscle, midline.

contents:

• submental lymph nodes
• submental artery+veins
• mylohyoid nerves
• veins draining to anterior jugular vein

Question 4

submandibular (digastric) triangle

Answer 4

borders- 2 bellies of dogastric muscle + mandible

contents:

• submandibular gland
• submandibular lymph nodes
• CN 12 (hypoglossal nerve)
• facial artery+veins
• linguinal artery, vein, nerve.

**facial artery gives branch to submental artery+vein.

Question 5

carotid triangle

Answer 5

borders - sternocleidomastoid, superior belly of omohyoid, posterior belly of digastric.

contents:

• Carotid sheeth ( before bifurcation of common carotid artery, contains the internal jugular vein, Vagus nerve, and common carotid artery..)
• deep cervical ansa
• CN 11, 12 (accessory + hypoglossal)
• deep cervical lymph nodes
• sympathetic trunk

Question 6

muscular (omotracheal) triangle

Answer 6

borders - superior belly of omohyoid, hyoid bone, sternocleidomastoid, midline.

contents:

• 3 infrahyoid muscles ( sternothyroid, sternohyoid, thyrohyoid)
• thyroid + parathyroid glands
• larynx
• pharynx
• superior thyroid artery+veins