The position, relations and appearing planes of the deep cervical fascial spaces were observed on the thin serial axial sections. The dangerspace was proved to exist.
The results showed that the pretracheal space and the posterior infrahyoid space located in front of the viscera of the neck and the retropharyngeal space and the dangerspace behind it respectively.
结果表明，在颈部脏器的前方存在气管前间隙和舌骨下肌后间隙，在后方存在咽后间隙和危险间隙。
3
One thing that seemed to worry Theresa Hitchens is that the new weapon could increase the danger of a space arms race.