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Transtentorial herniation, close up view of ventral surface of brain.

Last updated on Wednesday, April 15 2009 by gliageek

Transtentorial herniation, close up view of ventral surface of brain.

This close up photograph demonstrates compression of the oculomotor nerve against the (removed) tentorium cerebelli by the expanding hemispheric brain parenchyma. As the parasympathetic innervation to the anterior eye is carried by fibers on the surface of this nerve, compression results in unopposed sympathetic activity to the ciliary muscle, manifested as a fixed, dilated pupil.

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