[Table/Fig-1]:

Ultrasound image of the lateral pterygoid muscle during mouth closing (a) and opening the circle shows the pterygopalatine fossa; the vessel enhanced in colour Doppler imaging is the sphenoid palatine artery and the dashed line illustrates the needle trajectory (b). Visualization of the lateral pterygoid muscle and pterygopalatine fossa by using computed tomography (c). Transducer and needle positioning during ultrasound-guided deep trigeminal nerve block. (d).

SM, superficial masseter muscle; DM, deep masseter muscle; TM, temporalis muscle

MA, maxillary artery; SA, sphenoid palatine artery; CORP, coronoid process

CODP, condylar process; LPM, lateral pterygoid muscle; LPP, lateral pterygoid plate.