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': 'During surgical removal of the tongue _____ part of the lingual artery is ligated before it gives any branches to tongue or tonsils: \nSelect and explain. \nA. First, B. Second, C. Third, D. Fourth', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Lingual Artery\nThe lingual artery arises from the external carotid artery opposite the tip of the greater cornua of the hyoid bone.\nIts course is divided into four parts by the hyoglossus muscle.\nThe first part lies in the carotid triangle. It forms a characteristic upward loop which is crossed by the hypoglossal nerve. The lingual loop permits free movements of the hyoid bone.\nThe second part lies deep to the hyoglossus along the upper border of hyoid bone.\nIt is superficial to the middle constrictor of the pharynx.\nThe third part is called the arteria profunda linguae, or the deep lingual artery. It runs upwards along the anterior border of the hyoglossus, and then horizontally forwards on the undersurface of the tongue as the fourth part.\nIn its vertical course, it lies between the genioglossus medially and the inferior longitudinal muscle of the tongue laterally. The horizontal part of the artery is accompanied by the lingual nerve.\nDuring surgical removal of the tongue, the first part of the artery is ligated before it gives any branch to the tongue or to the tonsil.', 'role': 'assistant'}]