阴茎骨
Ida is female because she doesn't have a baculum, or penis bone. 爱达是雌性,因为她没有阴茎骨。
The exine of all species can be distinguished by itstectum, baculum and foot-layer. 透射电镜下观察,5种植物花粉外壁均可分为覆盖层、柱状层和基层。
The study shows a connection between OHC levels and reduced size of the uterus in female bears and reduced size of the testis and baculum in males. 这项研究显示，OHC浓度与母熊子宫及公熊的睪丸和阴茎骨变小有关。
A large baculum, or penis, is critical for successful mating in an arctic climate, the researchers note, and even slight decreases may interfere with reproduction. 研究人员指出，一个大阴茎骨（或阴茎），对于要在北极天候下成功交配而言至关重要，即使微幅变小都可能妨碍到繁殖功能。
A positive relationship between baculum length and prolonged intromission patterns in mammals 哺乳动物阴茎骨长度与延长性插入模式之间存在正相关的关系
