Anatomy 4 - anatomy of the neck and supraclavicular nerves of the brachial plexus

Question 1

What are the borders of the anterior neck triangle?

Answer 1

Ant: med line of neck
Post: sternocleidomastoid
Inf/base: jugular notch
Roof: platysma muscle

Question 2

What are the subdivisions of the anterior neck triangle?

Answer 2

submandibular, submental, carotid

Question 3

What are the borders of the carotid triangle?

Answer 3

Ant: sup belly of omohyoid muscle
Sup: post belly of digastric muscle
Post: ant margin of sternocleidomastoid

Question 4

What are the contents of the carotid triangle?

Answer 4

common carotid artery, carotid sinus, int jugular vein, vagus nerve, ext carotid, hypoglossal nerve, ansa cervicalis, accessory nerve, thyroid, larynx, pharynx, brachial plexus

Question 5

What are the borders of the posterior neck triangle?

Answer 5

Ant: sternocleidomastoid
Post: ant border of traps
Inf/base: middle 1/3 clavicle
Roof: deep cervical fascia

Question 6

What are the contents of the posterior neck triangle?

Answer 6

cervical plexus, suprascapular part of brachial plexus, cervical and suprascapular vessels, lymph nodes

Question 7

What are the subdivisions of the posterior neck triangle?

Answer 7

• occipital triangle
• supraclavicular triangle
• divided by omohyoid muscle

Question 8

What is thoracic outlet syndrome?

Answer 8

• neurovascular compression
• costoclavicular space
• scalene triangle

Question 9

What are the borders of the axilla?

Answer 9

Ant: pec major (+minor)
Post: subscapularis, lat dorsi, teres major
Med: ribs 1-4 + intercostals, serratus ant
Lat: floor intertubercular sulcus

Question 10

What are the contents of the axilla?

Answer 10

infraclavicular part of brachial plexus, axillary artery, lymph nodes, fat and connective tissue

Question 11

What are the supraclavicular branches of the brachial plexus?

Answer 11

Roots:
-nerves to scalini and longus colli
-branch to phrenic
-dorsal scapualar
-long thoracic
Trunks
-nerve to subclavius
-suprascapular

Question 12

Dorsal scapular

Answer 12

• muscular branches supply: levator scap, rhomboids
• no sensory branches
• runs posteriorly

Question 13

Long thoracic

Answer 13

• muscular branches: serratus ant
• no sensory branches
• post to brachial plexus

Question 14

Suprascapular

Answer 14

• muscular branches: infraspinatus, supraspinatus
• no sensory branches
• passes through suprascapular notch and around spinoglenoid notch