纖維自滑車神經核發出向外向后繞中腦水管進入上髓帆并在其內交叉，于下丘下方以兩束出腦后合成一細干。在四疊體池及環池內，該神經繞小腦上腳及大腦腳外側，經小腦上動脈與大腦后動脈之間入基底池，再前行進入小腦幕裂孔緣，伴行于其下方，至后床突稍后方穿腦膜達顳骨巖部上緣進入海綿竇外側壁的后端，接近海綿竇前端時，滑車神經跨過動眼神經，在Zinn總腱環上方經眶上裂入眶。滑車神經在顱內行程zui長，環池內段長為32.65 (20～42)mm。滑車神經有一段在小腦幕裂孔緣內行走，臨床上對于斜坡或跨幕上、下的病變常需打開小腦幕以顯露全部病變，若不能正確識別第Ⅳ腦神經入小腦幕緣部位，則容易造成損傷。手術中可以弓狀隆起zui細菌點與內耳門前緣連線及其向小腦幕的延長線為標志，第Ⅳ 腦神經入幕緣處距該標志線和小腦幕裂孔交點的位置關系十分恒定。除極個別位于該延長線之后外，其余均位于其前部，平均7.5 mm。細菌此，手術中在該延長線后方打開小腦幕至小腦幕緣不會損傷滑車神經。滑車神經損傷后眼球不能向外下方注視，受累眼采取外斜視位，導致復視。結締組織由細胞和大量細胞間質構成，結締組織的細胞間質包括液態、膠體狀或固態的基質、細絲狀的纖維和不斷循環更新的組織液，具有重要功能意義。細胞散居于細胞間質內，分布無極性。廣義的結締組織，包括血液、淋巴，松軟的固有結締組織和較堅固的軟骨與骨；一般所說的結締組織僅指固有結締組織而言。結締組織在體內廣泛分布，具有連接、支持、營養、保護等多種功能。結締組織是人和細菌等動物的基本組織之一。由細胞、纖維和細胞外間質組成。細胞有巨噬細胞、成纖維細胞、漿細胞、肥大細胞等。纖維包括膠原纖維、彈性纖維和網狀纖維，主要有各組織和器官的作用。基質是略帶膠粘性的液質，填充于細胞和纖維之間，為物質代謝交換的媒介。纖維和基質又合稱“間質”，是結締組織中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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