Brachial Plexus

Question 1

What are the main nerve branches of the brachial plexus ROOTS? What do they innervate?

Answer 1

1. Dorsal Scapular (C5)–>
   
   1. Levator Scapulae
   2. Rhomboid Major/Minor
2. Long Thoracic (C5-C7)–>
   
   1. Serratus Anterior

Question 2

What are the main nerve branches of the brachial plexus TRUNKS? What do they innervate?

Answer 2

1. Superior Trunk
   
   1. Nerve to subclavius (C5-C6)–>
      
      1. Subclavius
   2. Suprascapular (C5-C6)–>
      
      1. Supraspinatous
      2. Infraspinatous

Question 3

What are the main nerve branches of the brachial plexus CORDS? What do they innervate?

Answer 3

1. Lateral Cord
   
   1. lateral pectoral (C5-C7)–>
      
      1. Pec Major
2. Posterior Cord
   
   1. Upper subscapular (C5)–>
      
      1. Subscapularis
   2. Thoracodorsal (C6-C8)–>
      
      1. Lats
   3. Lower Subscapular (C6)–>
      
      1. Teres Major
      2. Subscapularis
3. Medial cord
   
   1. Medial Pectoral (C8-T1)–>
      
      1. Pec major/minor
   2. Medial cutaneous arm (C8-T1)
   3. Medial Cutaneous forearm (C8-T1)

Question 4

What are the main nerve branches of the brachial plexus BRANCHES? What do they innervate?

Answer 4

1. Musculocutaneous (C5-C7) –>
   
   1. Coracobrachialais
   2. Biceps Brachii
   3. Brachialis
2. Axillary (C5-C6)–>
   
   1. Delts
   2. Teres Minor
3. Radial (C5-T1)–>
   
   1. Triceps
   2. Lateral Forearm/ Hand
4. Median (C6-T1)–>hand muscles
5. Ulnar (C8-T1)–> Medial Forearm and Hand

Question 5

What nerve is superficial to the serratus anterior?

Answer 5

Long Thoracic which innervates it.

C5-C7 wings to heaven