damage to the accessory nerve would result in
Accessory nerve disorder Injury to the spinal accessory nerve can cause an accessory nerve disorder or spinal accessory nerve palsy, which results in diminished or absent function of the sternocleidomastoid muscle and upper portion of the trapezius muscle.
Hardware disease If hardware disease is suspected, a magnet should be administered orally through a tube into the reticulum. Depending on the type of magnet used, inserting a second magnet could cause internal pinching which could lead to serious complications. A broad-spectrum antibiotic should also be given to control infection. The cow should be confined and movement limited in the hopes that the reticulum can repair the hole.[3] Surgery is necessary in some cases and involves rumenotomy with a physical removal of the object. In some advanced cases that donâ€™t respond to medical or surgical therapy, slaughter should be considered from an economic perspective.[2]