Bisaria K K
Department of Anatomy, King George's Medical College, Lucknow, U.P., India.
J Anat. 1988 Aug;159:29-35.
In a study of 80 cavernous sinuses in 40 cadavers, the trochlear nerve entered the cavernous sinus in 87.5% of cases before the crossing, in 7.5% at the crossing and in 5.0% after the crossing of the free and the attached margins of the tentorium cerebelli. In 77.5% of specimens the trochlear nerve showed a marked bend with flattening at the site of its entrance into the cavernous sinus. The nerve ran between the superficial and deep layers of dura, partly between them, in the thickness of the deeper layer, or deep to the deep layer but adherent to it. These findings do not conform with the description of its course by other workers in the past. In 72.5% of specimens the size of the trochlear nerve was larger during its course in the cavernous sinuses but in 20.0% of specimens such an increase in thickness was noted even in the posterior cranial fossa. Only in one specimen was the trochlear nerve adherent to the ophthalmic division of the trigeminal nerve. Cases showing the trochlear nerve entering the cavernous sinus after the crossing of the two margins of tentorium cerebelli and the splitting and branching of the trochlear nerve in the cavernous sinus have not hitherto been reported.
在一项对40具尸体的80个海绵窦的研究中，滑车神经在小脑幕游离缘与附着缘交叉之前进入海绵窦的占87.5%，在交叉处进入的占7.5%，在交叉之后进入的占5.0%。在77.5%的标本中，滑车神经在进入海绵窦处呈现明显弯曲并变扁平。该神经走行于硬脑膜的浅层与深层之间，部分位于两层之间，部分位于深层内，或在深层之下但与之相连。这些发现与以往其他研究者对其走行的描述不符。在72.5%的标本中，滑车神经在海绵窦内走行时变粗，但在20.0%的标本中，甚至在后颅窝就已观察到其变粗。仅在1例标本中，滑车神经与三叉神经眼支相连。此前尚未有滑车神经在小脑幕两缘交叉之后进入海绵窦以及滑车神经在海绵窦内分支的病例报道。
