单词cervical flexure
un.: 颈曲网络: 向背侧的颈曲;颈屈曲;颈摺
颈曲
The embryonic body flexed and turned around, and then cephalic flexure, cervical flexure and dorsal flexure emerged at the 7th stage;
第7期胚体发生了屈曲与扭转,出现了头曲、颈曲和背曲;