]> 2026-07-31T09:41:41+00:00 WBR0334 0 en 1st The maxillary artery is derived from the 1st aortic arch. 2nd The stapedial and hyoid arteries are derived from the 2nd aortic arch. 3rd The common carotid artery and the proximal segment of the internal carotid artery are derived from the 3rd aortic arch. 4th The aortic arch and the proximal part of the right subclavian artery are derived from the 4th aortic arch. 6th The proximal segments of the pulmonary arteries and the ductus arteriosus are derived from the 6th aortic arch. The patient is most likely presenting with epidural hematoma following the motor vehicle collision due to a fracture of the temporal bone that leads to rupture of the middle meningeal artery, a branch of the maxillary artery. Based on the CT scan findings, there is a biconvex blood collection that appears hyperdense. It does not cross the suture lines, but may cross the falx and the tentorium. Embryologically, the maxillary artery is derived from the 1st aortic arch.<br/> '''Educational Objective:''' The middle meningeal artery, ruptured in epidural hematomas, is a branch of the maxillary artery. The maxillary artery is derived from the first 1st aortic arch.<br/> '''References:''' First Aid 2014 page 462 Embryology A Neurology 2020-10-28T00:12:57Z 2459150.5089931 WBR0334