Post-styloid space of parapharyngeal space contains all, EXCEPT:

The parapharyngeal space is a potential space, shaped like an inveed pyramid spanning the skull base to the hyoid. The boundaries of the space are separated by the styloid process and its associated fascial attachments into the "prestyloid" and "poststyloid" compaments. The contents of the prestyloid space are the parotid, fat, and lymph nodes. The poststyloid compament is composed of CNs IX to XII, the carotid space contents, cervical sympathetic chain, fat, and lymph nodes. Ref: Schwaz's principle of Surgery 9th edition, chapter 18.