结果：面神经阻滞进针的深度：乳突尖至茎乳孔的距离，男性左侧为16。
Result: The needle inserted depths from mastoid into stylomastoid foramen for males and females were 16.
头侧直肌起始于tpa的上表面，止于枕骨颈静脉突的下表面，可作为确定颅外颈静脉孔、茎乳孔的解剖标志。
The rectus capitis lateralis muscle extends vertically behind the internal jugular vein from the TPA to the jugular process of the occipital bone.
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