Nutation and counternutation are movements that occur in the sacroiliac joint (SIJ), which is a paired joint formed between the sacrum and the ilium. Both movements are important in the context of posture, walking, and childbirth, and they involve the sacrum, coccyx, and hip bones. For the full description of these movements, check out this video in our Media Library!📹 Learn human anatomy fast at Anatomy.app!🧠 https://anatomy.app #anatomy #medschool #medstudent | Anatomy.app

【控制系统】五 频率响应（分析）法 #波特图 和 #奈奎斯特图 的深入理解👌 #辐角定理