纤维自滑车神经核发出向外向后绕中脑水管进入上髓帆并在其内交叉，于下丘下方以两束出脑后合成一细干。在四叠体池及环池内，该神经绕小脑上脚及大脑脚外侧，经小脑上动脉与大脑后动脉之间入基底池，再前行进入小脑幕裂孔缘，伴行于其下方，至后床突稍后方穿脑膜达颞骨岩部上缘进入海绵窦外侧壁的后端，接近海绵窦前端时，滑车神经跨过动眼神经，在Zinn总腱环上方经眶上裂入眶。滑车神经在颅内行程zui长，环池内段长为32.65 (20～42)mm。滑车神经有一段在小脑幕裂孔缘内行走，临床上对于斜坡或跨幕上、下的病变常需打开小脑幕以显露全部病变，若不能正确识别第Ⅳ脑神经入小脑幕缘部位，则容易造成损伤。手术中可以弓状隆起zui细菌点与内耳门前缘连线及其向小脑幕的延长线为标志，第Ⅳ 脑神经入幕缘处距该标志线和小脑幕裂孔交点的位置关系十分恒定。除极个别位于该延长线之后外，其余均位于其前部，平均7.5 mm。细菌此，手术中在该延长线后方打开小脑幕至小脑幕缘不会损伤滑车神经。滑车神经损伤后眼球不能向外下方注视，受累眼采取外斜视位，导致复视。结缔组织由细胞和大量细胞间质构成，结缔组织的细胞间质包括液态、胶体状或固态的基质、细丝状的纤维和不断循环更新的组织液，具有重要功能意义。细胞散居于细胞间质内，分布无极性。广义的结缔组织，包括血液、淋巴，松软的固有结缔组织和较坚固的软骨与骨；一般所说的结缔组织仅指固有结缔组织而言。结缔组织在体内广泛分布，具有连接、支持、营养、保护等多种功能。结缔组织是人和细菌等动物的基本组织之一。由细胞、纤维和细胞外间质组成。细胞有巨噬细胞、成纤维细胞、浆细胞、肥大细胞等。纤维包括胶原纤维、弹性纤维和网状纤维，主要有各组织和器官的作用。基质是略带胶粘性的液质，填充于细胞和纤维之间，为物质代谢交换的媒介。纤维和基质又合称“间质”，是结缔组织中zui多的成分。
Fibers from the trochlear nerve nuclei are sent outward and backward around the midbrain water pipes into the medulla and cross in the inside of the inferior colliculus to make two out of the brain to synthesize a thin stem. In the quadruple pool and ring pool, the nerve around the top of the cerebellum and the outer part of the brain, between the superior cerebellar artery and the posterior cerebral artery into the basal cistern, and then marched to the edge of the cerebellar apocrine, accompanied by the following, to The posterior bed suddenly penetrates the upper edge of the medial temporal petrosal bone into the posterior end of the lateral wall of the cavernous sinus. When approaching the anterior end of the cavernous sinus, the trochlear nerve traverses the oculomotor nerve and clefts into the orbit above the Zinn's total tendon. Trochanteria longest stroke in the brain, the Central section of the pool length of 32.65 (20 ~ 42) mm. Toothed nerve has a period of walking in the margins of the cerebellar aponeurosis, clinically for the slope or supratentorial lesions often need to open the cerebellum to reveal all the lesions, if not correctly identify the fourth cranial nerve into the cerebellar edge of the site, it is easy Cause damage. Surgery can arcuate uplift the most bacterial point and the inner ear front connection and the extension of the line to the cerebellum as a sign of the fourth cranial nerve into the edge from the mark line and the location of the intersection of the cerebellar tear hole position is very constant. With the exception of a few of them located behind the extension line, the rest are located on the front, averaging 7.5 mm. Bacteria, surgery in the extension of the line behind the opening of the cerebellum to the cerebellum to the trailing edge will not damage the trochlear nerve. Torso nerves after the eye injury can not be outside the bottom of the gaze, the affected eye to take exotropia, leading to diplopia. Connective tissue consists of cells and a large number of interstitial cells, connective tissue interstitial including liquid, colloidal or solid matrix, filamentous fibers and the circulation of the updated tissue fluid, has important functional significance. Cells scattered in the interstitial cells, the distribution of non-polar. Generalized connective tissue, including blood, lymph, soft connective tissue and the more solid cartilage and bone; commonly referred to connective tissue refers only to the inherent connective tissue. Connective tissue widely distributed in the body, with the connection, support, nutrition, protection and other functions. Connective tissue is one of the basic tissues of animals such as humans and bacteria. By the cells, fibers and extracellular matrix composition. Cells are macrophages, fibroblasts, plasma cells, mast cells and so on. Fibers, including collagen fibers, elastic fibers and reticular fibers, are mainly associated with the function of various tissues and organs. Matrix is a slightly adhesive liquid, filled in cells and fibers, the exchange of material for the media. Fibers and matrices are collectively called "interstitial" and are the most common component of connective tissue.

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