视神经管位于眼眶的底端和眶下裂的内下侧 ,始发于视神经孔 ,向后 ,向上并向内至中颅窝。该管大部为蝶骨小翼的根部构成。其内侧为蝶窦和后组筛窦 ,中间由一层很薄的骨板相隔。因此视神经管壁极易因冲击而受到损伤。视神经管在眶内部分为垂直卵圆形 ,中部为圆形 ,颅内开口部分 The optic canal, located at the bottom of the orbit and the medial underside of the infraorbital fissure, originates in the optic nerve hole, posterior, upward, and inward to the middle cranial fossa. Most of the tube is composed of the sphenoid wing root. The inside of the sphenoid sinus and posterior ethmoid sinus, the middle by a thin layer of bone separated. Therefore, the optic nerve wall vulnerable to damage due to impact. Optic tube in the orbital part of the vertical oval, the middle of a circular, intracranial open part