Brachial Plexus

Question 1

What is the most common nontraumatic condition and usually affects the upper plexus and shoulder girdle muscles, is more severe at night, and characterized by the acute onset of pain in the shoulder and upper arm, followed by weakness of variable severity?

Answer 1

Neuralgia amyotrophy

Question 2

What lesion is associated with weakness of the shoulder and upper arm and sparing of the the hand with gross wasting of the shoulder girdle muscles with a complete inability to abdcut or externally rotate the arm and marked weakness of elbow flexion and radial wrist extension; Stretch injuries to the upper trunk may be combined with a C5, C6 root avulsion (Erb’s Palsy)?

Answer 2

Upper trunk lesion

Question 3

What lesion is rare and occurs with lateral traction on the arm?

Answer 3

Middle trunk lesion

Question 4

What lesion is associated with traction applied to fully abducted arm and may be combined with C8/T1 root
avulsion (Klumpke’s Palsy)?

Answer 4

Lower Trunk lesion