The normal brain artery can bear the pressure of the 80 kPas(600 mmgs) the following but unlikely broken.But compared with the artery of other parts of human body, the characteristics of the brain artery is the wall tube thinner, the intermediate muscle cell less, outside film connective organization not flourishing but don't become the obviously outside elasticity layer.Over a long period of time the high blood pressure certanly will cause small artery harden, at some usually bear the part of the high pressure, supply a brain to organize especially of wear to pay( if brain in artery of the bean veins artery, the basic vertebra artery of side exact center artery) to present the right angle with the lord stem to divide, bear the bigger pressure to hurtle to infuse, can become the tiny aneurysm, easy break to result in the apoplexy.

    The artery gruel kind hardens to have of also spread to the small artery, make the blood wall change sex, the artery organization surroundings lacks to learn from bad habit the dead.At the blood pressure go up can break the issue of blood.The high blood pressure and arteries usually harden to exist at the same time, promoting mutually, constituting the most cause of disease of the apoplexy, being called the high blood pressure artery hardening issue of blood.Other seldom seen cause of diseases have: ①The small congenital action vein abnormal inside the brain of or aneurysm blowout; ②The brain artery inflammation wall takes care of the bad dead; ③ The brain lump bleed; ④The blood disease erupts the brain internal bleeding; ⑤The anti- coagulate medicine inducts etc..80% apoplexy occurrence in brain, become the direct blood inside the brain of 2-8 nms swollen.Bleed the cooking stove great majority locates inside the bag- base stanza area.Issue of blood the one who limit at the hillock brain neighborhood calls the seamy side type( or brain type of hillock .) The one who limit at hull pit, outside bag and take the form pit is called the outside side type( or the hull pit type.) Call if bleed the scope bigger, expand to postpone inside the bag of inside outside two sideses,, hybrid type or inside the bag bleed.The blood can break into the brain room or the spider's web films antrum , also can follow a fiber flows into the brain, bridge brain.A handful of brain internal bleedings locate the sum crest, leaf of pillow in the white quality, another have about 20% hair with original apoplexy in the brain stem and cerebellum, the former locates the bridge brain more, the latter locates the cerebellum hemisphere more.Swollen and housebound period of blood but present the different appearance, such as solidify, liquefy or the bag antrum formation.Become the blood of the bag antrum swollen be called to suffer a stroke the bag swollen, its bag wall has to gobble up the cell in great quantities, swallowing to contain the yellow vegetable of blood of iron.The swollen surroundings brain of impatient period blood organize obviously, the hemisphere physical volume enlarge, to move a formation brain hernia to the side, and distort, oppress the brain stem, after hair brain the stem bleed, often for direct reason that apoplexy cause death.

    2.The spider's web film next the cavity bleed( subara chmid hemorrhage)

    Suffer a stroke for an issue of blood that caused by various diseases, the main locate the brain bottom inside the skull of congenital artery tumor, the artery hardening aneurysm and the brain form shallow part vein abnormal( AVM) break, the blood is direct to flow into the spider's web film cavity with the result that.Other if the high blood pressure artery harden, tumor, skull brain external injury inside the skull , afferent inflammation , blood is far-gone,, with cause the brain substance issue of blood is lord, the blood wears through the brain room or the skin qualities, the indirectly flows the spider's web film to descend the skull, be called after deliver sex spider's web film the skull bleeds or accumulates the blood, to show the differentiation.

    The congenital aneurysm is most take place in the brain bottom artery furcation department , because of the intermediate growth blemish of the place's artery, the tube wall is weak, wasing pound at by blood but extending gradually, the formation bag form or take the aneurysm of the pedicel bag form.The arteriovenous abnormality located in the action vein abnormal of a shallow watch of brain department, take care of the wall growth humble thin.These afferent disease gradually development , the blood can seep into the very and weak place of wall, ;At the high blood increases suddenly high, alter the blowout and bleed.The blood is directly to flow into the spider's web film antrum , stimulate the meninges and blood vessels, after plusing the blood cell breakage, the each afferent movable material that release such as go to AN adrenaline etc., can induct the artery spasm, the serious hour can cause the brain to obstruct or the brain do to lack the blood, becoming important factor that aggravates the condition to even cause die.A great deal of spider's web film next the issue of blood of antrum can cause the skull inside press to increase high even brain hernia .
    The spider's web film next the antrum has to accumulate the blood or the blood coagulate pieces in great quantities.Congenital 85% of aneurysm delivers for the list, the size is different, diameter about several millimeter go to the several centimeter,locate the brain bottom artery wreath( the willis artery wreath) neighborhood mostly;Also can locate the artery branch of the vertebra artery department, but 80% occurrence in the crotch of the artery branch inside the neck.The artery abnormal locates a shallow watch department of brain more;The gruel kind hardens the aneurysm to locate brain bottom more.It is thus clear that bleed the nearby or extensive brain dropsy of cooking stove.Sometimes the companion hair blood inside the brain is swollen or the brain obstruct.The of the death merges the pillow big bore hernia and open space hernia more.