Neck Dissection Session2

Question 1

Boundaries of the carotid triangle

Answer 1

Posterior belly of digastric

Superior belly of omohyoid

Sternocleiomastoid

Question 2

Boundaries of the anterior triangle

Answer 2

Mandible
Middling of neck
Sternocleiomastoid

Question 3

Boundaries of the posterior triangle

Answer 3

Sternocleiomastoid
Clavicle
Trapezius

Question 4

Vascular contents of the carotid triangle

Answer 4

Common carotid artery (bifurcates within C3/4 or upper border thyroid cartilage)

IJV

Hypoglossal nerve

Vagus Nerve

Question 5

Midline of neck key structures

Answer 5

Hyoid bone

Laryngeal prominence of thyroid cartilage

Cricoid cartilage

Lobe of thyroid gland

First tracheal ring

Isthmus of the thyroid gland

Question 6

Cervical fascia layers

Answer 6

Superficial fascia
Deep
(Posterior to anterior):

Investing layer

Pre-vertebral

Carotid sheath

Pre-tracheal

Find them on a diagram (page 4 lecture)

Question 7

Where are sternocleiomastoid and trapezius?

Answer 7

Trapezius- very back laterally in investing layer

SCM - anterior laterally in investing layer

Question 8

What landmarks are at the C3, C4 and C6 vertebra levels

Answer 8

C3 - hyoid bone

C4- upper margin of thyroid cartilage and bifurcation of CCA

C6 - cricoid, start of oesophagus and trachea

Question 9

Where is the external jugular vein found?

Answer 9

Deep to platysma but superficial to SCM within the superficial fascia

Question 10

Contents of the posterior triangle

Answer 10

Phrenic Nerve 
Anterior scalene 
Subclavian artery 
Brachial plexus 
Middle scalene

(Superficial to deep)