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.
目的：探讨枕骨大孔区腹侧肿瘤的合理手术入路，进一步提高其手术治疗效果。
Objective: to develop rational surgical approach and to further improve the surgical outcomes to foramen magnum tumors.
换言之就是胎儿枕骨位于母亲骨盆左前侧。
In other words, the fetal occiput is directed towards the mother's left, anterior side.
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