Quotation from: Manual of Surgery

Written by: Alexander Miles and Alexis Thomson


_Post-anaesthetic paralysis_ occurs in patients in whom, during the
course of an operation, the arm is abducted and rotated laterally or
extended above the head, causing over-stretching of the plexus,
especially of the fifth, or fifth and sixth, anterior branches.


A _cervical rib_ may damage the plexus by direct pressure, the part
usually affected being the medial cord, which is made up of fibres from
the eighth cervical and first dorsal nerves.

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