The carotid space is a roughly cylindrical space in the head and neck. It extends from the skull base through to the aortic arch and is circumscribed by all three layers of the deep cervical fascia, forming the carotid sheath. The bifurcation of the common carotid usually occurs at the boundary of the suprahyoid and infrahyoid spaces. A mass originating from the carotid space will cause anterior displacement of the parapharyngeal space.
The suprahyoid portion of the carotid space is often synonymous with the post-styloid compartment of the parapharyngeal space.
Relations of the suprahyoid carotid space: