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颅内的蛛网膜包裹整个脑组织,与脑组织表面的软膜之间共同形成蛛网膜下腔。在大脑凸面,蛛网膜通常与软膜贴合较紧,因此蛛网膜下腔的空间较小,而在脑叶凹陷处及颅底等部位,蛛网膜下腔明显扩大,其中又有大量的蛛网膜小梁、纤维、网膜以及隔膜等将其分隔为各个腔室,这些腔室被称为脑池。脑池构成了颅内的自然解剖间隙,里面充满脑脊液,包含重要的血管和神经组织结构,蛛网膜下腔共同构成脑脊液的循环通路和储存体系,这些结构与脑脊液循环障碍、动脉瘤
The intracranial arachnoid wraps the entire brain tissue, forming a subarachnoid space with the soft membrane on the surface of brain tissue. In the convex surface of the brain, the arachnoid is usually tight fit with the soft membrane, so the subarachnoid space is small, and in the brain lobe depression and skull base and other parts of the subarachnoid space was significantly expanded, in which there are a large number of cobweb Trabecular meshwork, fibers, omentum, and septum are separated into chambers that are called brain pools. The cerebral pool constitutes a natural intracranial anatomic space filled with cerebrospinal fluid that contains important vascular and nerve tissue structures that together form the cerebro-spinal fluid circulation pathways and storage systems that are associated with circulatory disorders of the cerebrospinal fluid and aneurysms