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n.vagus

I dont know about perforation, but head injury can cause cerebral edema, which increases intracranial pressure, what irritates the vagus. As you know, its responsible for gastric secretion of HCL. Extra secretion can irritate gastric mucosa and lead to ulcers.
Hope, I remember that right :))
 

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The ulcer from the head injury causes the perforation. it is like saying NSAIDS cause perforation? how? no prostaglandins leads to no vasodilation of blood vessels leading to no mucosa health--> HCL damaging the mucosa-->Ulcer--> possible perforation.
 
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