====== Pars vascularis ======
The larger posterolateral compartment containing the vagal nerve (and branching Arnold’s nerve), spinal accessory nerve, and the [[internal jugular vein]]

Hovelacque ([[1967]]) was the first to propose the subdivision of [[jugular foramen]]. The foramen is divided by a fibrous or bony septum that joins the jugular spine of the petrous bone to the jugular process of the occipital bone, the anteromedial compartment ([[pars nervosa]]), and a posterolateral compartment ([[pars vascularis]]). 
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The larger, posterolateral, "pars vascularis" compartment contains CN X, CN XI, Arnold's nerve (or the auricular branch of CN X involved in Arnold's reflex, where external auditory meatus stimulation causes cough), jugular bulb, and posterior meningeal branch of ascending pharyngeal artery
((Hovelacque A. (1967): Osteologie . Paris, G. Doin and Cie.
155-156.)).