Important MCQS and VIVA Points. 

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Important SEQS First priority; Explain the location and roots of the largest parasympathetic (pterygopalatine) ganglion. nd 2 pWrhioatrairteyt;he boundaries and contents of pterygopalatine fossa? How maxillary nerve enters the pterygopalatine fossa. Enumerate its branches and how it terminates? NOTEW; Dhaotfairestthpericoormitmy uSEniQcsatfiiornsst aonf tdhtehpetnersyegcoopnadlaptirnieorfoitsysaS?EQs. Do not skip any Important MCQS and VIVA points. Pterygopalatine fossa lies between the pterygoid process of the sphenoid posteriorly and the rounded posterior aspect of the maxilla anteriorly. The fragile perpendicular plate of the palatine bone forms its medial wall. The incomplete roof of the pterygopalatine fossa is formed by a medial continuation of the www.themedicalglobe.com / www.mgElearning.net Page 1 of 4 infratemporal surface of the greater wing of the sphenoid. The floor of the pterygopalatine fossa is formed by the pyramidal process of the palatine bone. Pterygopalatine fossa’s superior larger end opens anterosuperiorly into the inferior orbital fissure; its inferior end narrows, continuing as the greater and lesser palatine canals. The contents of the pterygopalatine fossa are the: Terminal (pterygopalatine or third) part of the maxillary artery, and the initial parts of its branches, and accompanying veins (tributaries of the pterygoid venous plexus), Maxillary nerve (CN V2), with which the pterygopalatine ganglion is associated & Neurovascular sheaths of the vessels and nerves and a fatty matrix occupy all remaining space. The third part of maxillary artery lies anterior to the pterygopalatine ganglion The maxillary nerve runs anteriorly through the foramen rotundum, which enters posterior wall of the pterygopalatine fossa pterygopalatine ganglion lies in the superior part of the pterygopalatine fossa. The pterygopalatine nerves convey general sensory fibers of the maxillary nerve, which pass through the pterygopalatine ganglion without synapsing to supply the nose, palate, and pharynx. The maxillary nerve leaves the pterygopalatine fossa through the inferior orbital fissure, after which it is known as the infra- orbital nerve. www.themedicalglobe.com / www.mgElearning.net Page 2 of 4 The parasympathetic fibers to the pterygopalatine ganglion come from the facial nerve by way of the greater petrosal nerve (nerve of pterygoid canal). The parasympathetic fibers of the greater petrosal nerve synapse in the pterygopalatine ganglion. The deep petrosal nerve is a sympathetic nerve arising from the internal carotid peri-arterial plexus as the artery exits the carotid canal. Deep petrosal nerve conveys postsynaptic fibers from nerve cell bodies in the superior cervical sympathetic ganglion to the pterygopalatine ganglion by joining the nerve of the pterygoid canal. The sympathetic fibers do not synapse in the ganglion but pass directly through it into the branches (of CN V2) arising from it. The postsynaptic sympathetic fibers pass to the palatine glands, and the mucosal Impglfaingdus orfethfeonrasMal cCavQit,ySanEdQsuspearniodr pVhaIrVynAx. (KLM) 7.98 A & C 7.100 Copyright: Medical Globe 2020 www.themedicalglobe.com / www.mgElearning.net Page 3 of 4 www.themedicalglobe.com / www.mgElearning.net Page 4 of 4.

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