Triangles/Regions of the Neck

Question 1

What is A? What are its main contents and underlying structures?

Answer 1

Sternocleidomastoid Region
Sternocleidomastoid muscle; superior part of external jugular vein; greater auricular nerve; transverse cervical nerve
+ contents of supraclavicular fossa

Question 2

What is 1? What are its main contents and underlying structures?

Answer 2

Lesser supraclavicular fossa
Inferior part of internal jugular vein

Question 3

What is B? What are its main contents and underlying structures?

Answer 3

Posterior cervical region
Descending part of trapezius muscle; cutaneous branches of posterior rami of cervical spinal nerves

Question 4

Describe the position of the suboccipital region to the posterior cervical region.

Answer 4

Suboccipital region lies deep to the superior part of the posterior cervical region.

Question 5

What is C? What are its main contents and underlying structures?

Answer 5

Lateral cervical region/posterior triangle of neck
Part of external jugular vein, posterior branches of cervical plexus of nerves, spinal accessory nerve, trunks of brachial plexus, cervicodorsal trunk, cervical lymph nodes
+ subclavian triangle

Question 6

What is 2? What are its main contents and underlying structures?

Answer 6

Same as posterior triangle

Question 7

What is 3? What are its main contents and underlying structures?

Answer 7

Omoclavicular (subclavian) triangle
Third part of subclavian artery, part of subclavian vein (sometimes); suprascapular artery; supraclavicular lymph nodes

Question 8

What is D? What are its main contents and underlying structures?

Answer 8

Anterior cervical region of neck/anterior triangle of neck
Submandibular gland almost fills triangle; submandibular lymph nodes; hypoglossal nerve; mylohyoid nerve; parts of facial artery and vein
+ Submandibular triangle
+ Submental and carotid triangles

Question 9

What is 4? What are its main contents and underlying structures?

Answer 9

Submandibular (digastric) triangle
Submental lymph nodes and small veings that unite to form anterior jugular vein

Question 10

What is 5 and 6? What are their main contents and underlying structures?

Answer 10

5 = Submental triangle
6 = carotid triangle
Common carotid artery + its branches; internal jugular vein + its branches; vagus nerve; external carotid artery + some of its branches; hypoglossal nerve and superior root of ansa cervicalis; spinal accessory nerve; thyroid gland; larynx; pharynx; deep cervical lymph nodes; branches of cervical plexus

Question 11

What is 7? What are its main contents and underlying structures?

Answer 11

Muscular (omotracheal) triangle
Sternothyroid and sternohyoid muscles; thyroid and parathyroid glands