1. The CT and MRI features of the masticator space involvement were analysed.

2. Mainly applied in electric control system of masticator, banbury mixer , and other roll mill etc.

3. Conclusion Masticator space involvement is not uncommon in the maxillofacial diseases, which must be noticed in the imaging diagnosis.

4. Horace Fletcher earned the nickname "The Great Masticator" by his diet of chewing food thirty thirty two times (about 100 times per minute) before swallowing.

5. Results The muscles and fat in nasopharyngeal masticator space of 40 cases (80 sides) were well demonstrated on both T1WI and T2WI images.

6. Methods The MR images of nasopharyngeal masticator space in 40 healthy volunteers were analyzed.

7. Disease from surrounding structures can invade the masticator space via the pterygopalatine fossa , the buccal space immediately anterior to the ramus, the foramen ovale, or by way of direct invasion.

8. Purpose:To evaluate MRI and CT diagnosis in lesions of masticator space.

9. Conclusion MR imaging could demonstrate the muscles, fat, the course of internal maxillary artery and the main trunk of the mandibular nerve in the nasopharyngeal masticator space.

10. Shopping, don't always abrupt fantasy, such as buying a masticator to return to do mashed garlic, don't you think I this machine more economy?

11. Objective To discuss the appearance of normal structures in nasopharyngeal masticator space in vivo on MRI.

12. Stroll the time of store, don't always abrupt fantasy, for example want to buy a masticator to return to do mashed garlic, don't you feel my this machine more economy?

13. Materials and Methods CT and MRI findings of 21 cases with diseases arising from masticator space confirmed pathologically were retrospectively studied.