Brachial Plexus!

Question 1

What are the nerve roots for the long thoracic, dorsal scapular, suprascapular, and subclavian nerves? What do they each innervate?

Answer 1

. Long thoracic (C5-T1)- serratus anterior
. Dorsal scapular (C5)- rhomboids, levator scapulae
. Suprascapular (C5, C6)- supraspinatus, infraspinatus, glenohumeral joint
. Subclavian (C5, C6)- subclavius, sternoclavicular joint

Question 2

What are the nerve roots of the musculocutaneous, axillary, median, radial, and ulnar nerves? What do each innervate?

Answer 2

. Musculocutaneous (C5-C7)- BBC muscles
. Axillary (C5, C6)- deltoid and teres minor
. Median (C6-T1)- anterior forearm (except FCU), lateral half of FDP, lateral two lumbricals, thenars
. Radial (C5-T1)- posterior arm, forearm, and hand
. Ulnar (C8-T1)- FCU, medial half of FDP, interossei, medial two lumbricals, hypothenars

Question 3

Where do the dorsal scapular, suprascapular, and subclavian nerves each arise from?

Answer 3

. Dorsal scapular from C5 nerve root

. Suprascauplar and subclavian from superior trunk

Question 4

Which nerve arises from the lateral cord? What is the nerve root of this nerve and what does it innervate?

Answer 4

Lateral pectoral nerve (C5-C7)- pec major

Question 5

Which nerves arise from the posterior cord? What are the nerve roots of these nerves and what do they innervate?

Answer 5

. Upper subscapular (C5)- superior part of subscapularis
. Lower subscapular (C6)- inferior part of subscapularis and teres major
. Thoracodorsal (C6-T8)- Latissimus dorsi

Question 6

Which nerves arise from the medial cord? What are the nerve roots of these nerve and what do they innervate?

Answer 6

. Medial pectoral (C8-T1)- pec major and pec minor
. Medial cutaneous nerve of arm (C8-T1)- medial skin of upper arm
. Medial cutaneous nerve of forearm (C8-T1)- medial skin of lower arm