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顶骨在哪个部位-中医疣病网

顶骨在哪个部位

顶骨是颅骨之一,略呈扁正方形,在头的顶端,上下各一块。顶骨呈园顶状,并有一定的延展性。颅顶各骨中间以颅缝相连合,产生颅内压增高时,在小孩骨缝可稍分离出来。颅顶骨分成外侧、板障和边梁三层。那麼顶骨实际是在哪家位置呢?

颅顶骨在胚胎发育过程阶段是膜内在骨,出世时并未彻底骨化,因而,在一些位置仍保存膜性构造,如前囟和后囟等处。颅顶各骨均属扁骨。正前方为额骨,侧后方为枕骨。在额、枕骨中间是左、右顶骨。两边正前方小一部分为蝶骨大翼;侧后方绝大多数为颞骨鳞部。颅顶各骨中间以颅缝相连合,产生颅内压增高时,在小孩骨缝可稍分离出来。成年人颅顶骨的薄厚约为0.5cm,更厚的位置达到1cm,超薄的为颞区仅有0.2cm。

因为颅顶骨各处的薄厚不一,故开颅手术打孔时应予以留意。顶骨呈园顶状,并有一定的延展性。受外力作用严厉打击常常集中化于一点,成年人骨折线多以支承点为管理中心向四周放射性,而小孩颅顶骨延展性很大,故外伤性后易产生凹痕性骨折。颅顶骨分成外侧、板障和边梁三层。外侧偏厚,对支撑力的耐受力很大,而倾斜度较边梁为小。边梁较薄,色泽亦较敏感,别称夹层玻璃样版。

 

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