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乙状构的位置,很接近乳窦及乳小房,所以在乳突炎及中耳炎的时候,可能波及经过乙状沟中的乙状窦引起栓塞,同时在施行乳突及中耳的手术时也应该注意到乙状窦,避免它的损伤,因之乙状沟在颅骨外侧面的投影,也就有一定的临床价值。一般文献上对於乙状窦表面解剖学的记载,并不十分统一,例如格氏系统解剖学(Gray’s Anatomy)一书中,对於横窦的表面解剖学,是用两条线来表示的,第一条线是从枕外隆突点(inion)开始,走向耳点后方约2.5厘米处;
B-shaped position, very close to the sinus and breast cells, so in mastoiditis and otitis media, may affect the sigmoid sinus sigmoid sinus embolism, while the implementation of mastoid and middle ear surgery Should also pay attention to the sigmoid sinus, to avoid its damage, the sigmoid groove in the lateral projection of the skull, there is a certain clinical value. General literature on the surface of the sigmoid sinus anatomy is not very uniform, such as the Gray’s Anatomy (Gray’s Anatomy) in a book, for the transverse sinus surface anatomy, is represented by two lines , The first line starts from the inion and goes about 2.5 cm behind the ear;