This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': 'About lateral pterygoid muscle which of the following statement is true -a) Protude mandibleb) Arise from infra temporal fossa & lateral pterygoid platec) Bipolar headd) Supplied by facial nervee) Inserted into fovea of mandible \nSelect and explain. \nA. abce, B. abcd, C. acde, D. abde', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Lateral pterygoid (LP) \nOrigin\n\nUpper small head : From roof of infratemporal fossa and infratemporal crest of greater wing of sphenoid.\nLower larger head : Lateral surface of lateral pterygoid plate of sphenoid bone.\n\n\xa0\nInsertion\n\nPterygoid fovea on anterior swface. of neck of mandible.\nCapsule of temporomandibular joint and anterior and medial borders of its articular disc (some upper head\n\nfibers).\n\xa0\nNerve supply\n\nNerve to lateral pterygoid (one for each head) arise from anterior trunk of mandibular nerve.\nUpper and lateral part of lower head receive it form buccal nerve whereas medial part of lower head directly\n\nfrom anterior trunk of mandibular nerve.\n\xa0\nAction\n\nWhen left and right muscles contract together the condyle and disc is pulled forward and slightly downward from mandibular fossa. This protusion is indispensable to active mouth opening (old).\nIn clenching of jaw it prevents condyle and disc from pulling back (new concept).\nJaw pulled medially to opposite side (in unilateral contraction).', 'role': 'assistant'}]