Abstract:

Objective　To provide anatomical basis for selecting the type of intravascular stent and site for placing it.　Methods　(1)20 head specimens were selected and measured at the M1 segment of the middle cerebral artery, its branches and perforators through the left and right pterion approach, respectively. (2)100 angiography images of brains with no obvious diseases were selected, the course of the M1 segment of the middle cerebral artery and the openings of its perforators were observed.    Results   The length and caliber of the MI segment of middle cerebral artery was (13.14±3.62)mm and (3.41±0.38)mm through measurement in specimens, respectively, and  was (10.65±5.61)mm, (2.30±0.35)mm through measurement in angiography, respectively. There was significant difference in length and diameter between microanatomic measurement and angiographic measurement (P<0.05). Minute medial group of central branches originated from the superior and medial aspects of the the M1 segment of middle cerebral artery, whereas sizable lateral group of central branches originated from the superior and medial aspects of the arterial at its bifurcation. There was significant difference in length and diameter between  angiography of the M1 segment of the middle cerebral artery in male and female (P<0.05);  the M1 segment of the middle cerebral artery in male was longer and larger in diameter than that in female. Conclusion   This study can provide guidance for selecting the type and placing site of intravascular stent, avoiding obstruction the openings of central branches and thus preventing postoperative ischemia of the vascularized area of central branches.

Key words: Middle cerebral artery, Microanatomy, Angiography, Control observation