Fig. 6. Showing schematic presentation of development of middle cerebral artery (MCA). (A) Internal carotid artery (1) branches to form a cranial division (2) and caudal division at 4–5 mm stage (3). (B) Primitive anterior choroidal artery (4) arises from cranial division at a stage of 7–12 mm and cranial division continues as anterior cerebral artery (5). (C) Arterial twigs (7) appear distal to anterior choroidal artery (6) at a stage of 12–14 mm. (D) Caudal division continuing as posterior communicating artery (9); cranial division continuing as primitive olfactory artery (10); development of plexiform network from arterial twigs (8). (E) Disappearing plexiform network (11); development of MCA from plexiform network (12); development of medial olfactory artery from primitive olfactory artery (13); branch of primitive olfactory artery supplying nasal fossa (14); recurrent artery of Heubner arising from primitive olfactory artery (15). (F) MCA becoming prominent after regression of plexiform network at a stage of 16–18 mm (16); and (G) at 40 mm stage MCA acquires adult configuration (17).
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