BP Roots and Trunks
BP Cords and Branches
EMG Muscles Upper Limb
Lumbosacral nerves
Radiculopathy
100
This nerve branch arises primarily from the C5 spinal nerve root and innervates the levator scapulae, rhomboid major, and rhomboid minor muscles.
What is the Dorsal scapular nerve (DSN)?
100
This branch originates from the upper trunk and the lateral cord and terminates as the lateral antebrachial cutaneous nerve.
What is the musculocutaneous nerve?
100
Insertion point for EMG needle when testing this muscle.
What is APB?
100
The largest nerve in the human body.
What is the sciatic nerve?
100
This nerve root exits at the L4-L5 level.
What is L4?
200
This muscle is innervated by a nerve that originates at the nerve root of three levels of the cervical spine.
What is the Serratus anterior (Long Thoracic Nerve, C5-C6-C7)
200
The cords are named according to their anatomic relationship to this structure.
What is the axillary artery?
200
Flexor carpi radialis has almost identical innervation (but possibly more C7 contribution) to this muscle.
What is pronator teres?
200
A pure sensory nerve that branches directly from the lumbar plexus and innervates the anterolateral thigh.
What is the LFCN (aka the lateral cutaneous nerve of the thigh)?
200
This nerve root exits at the C5-C6 level.
What is C6?
300
These two rotator cuff muscles are innervated by a branch that comes directly from the upper trunk.
What are the supraspinatus and the infraspinatus? (suprascapular nerve)
300
This nerve has contributions from both the lateral and medial cords.
What is the median nerve?
300
This muscle is innervated by the radial nerve and is often tested when looking to "point out" a C8-T1 radiculopathy.
What is the extensor indicis proprius?
300
This branch of the lumbar plexus ends distally as the saphenous nerve.
What is the femoral nerve?
300
The dorsal primary ramus innervates these muscles.
What are the paraspinal muscles?
400
This palsy is associated with lower trunk birth injury.
What is Klumpke's palsy?
400
The latissimus dorsi is innervated by a nerve that originates from this cord.
What is the posterior cord? (thoracodorsal nerve)
400
Both the upper and the lower subscapular nerves innervate subscapularis, but the lower subscapular nerve also innervates this muscle.
What is Teres major?
400
This branch of the sacral plexus innervates the largest muscle in the human body.
What is the inferior gluteal nerve (L5-S1-S2)? (Gluteus maximus)
400
This structure accounts for why SNAPs are usually normal in radiculopathies.
What is the dorsal root ganglion?
500
A "Stinger" (aka "Burner") injury typically involves this trunk.
What is the upper trunk?
500
This nerve originates from the upper trunk and the posterior cord and is the most commonly injured nerve with glenohumeral joint dislocations.
What is the Axillary nerve?
500
This muscle is innervated by the radial nerve but without contributions from the middle or lower trunks.
What is the brachioradialis muscle? (C5-C6)
500
This nerve typically only has L1 root innervation.
What is the ilioinguinal nerve?
500
EMG evidence of active denervation in the following muscles would suggest a lesion of this structure.
Biceps brachii, Pronator teres, Brachioradialis, Triceps, and Serratus anterior.
What is the C6 nerve root?