<prompt> Fascial planes in the neck are of considerable surgical importance. Features of the neck fascia include all exceptSuperficial fascia contains platysma, external and anterior jugular veinsPretracheal fascia extends as far as the fibrous pericardiumInvesting layer of deep cervical fascia lies deep to the parotid glandPrevertebral fascia extends from base of skull to the axilla  <response>: Investing layer of deep cervical fascia splits to encase the parotid gland. Any acute enlargement of parotid gland mumps thus causes pain. 