The posterior limit of the posterior ethmoid is the skull base.At this point, it is more solid than it is anteriorly and serves as a reliable and safe location for its identification.
英
美
释义
后组筛窦的后界是颅骨,在此处,比前方坚实的骨质,可以做为确定后界可靠和安全的标帜。
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