system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Post-styloid space of parapharyngeal space contains all, EXCEPT:
assistant
The correct answer is  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.