Erb's palsy or paralysis-A condition caused by an injury to the upper brachial plexus, involving the cervical nerves C5, C6, and sometimes C7, affecting the upper arm and the rotation of the lower arm.
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Most injuries to the brachial plexus during birth involve the C5 and C6 nerve roots, affecting the movement of the shoulder, upper arm, and elbow.
Some popular tunings are C6 (C-E-G-A-C-E) and Dobro (G-B-D-G-B-D), but there are many, many other tunings with which lap steel players experiment.
The nerves of the brachial plexus are the fifth through the eighth cervical nerves (C5, C6, C7, and C8) and the first thoracic nerve (T1).