apex cornus posterioris medullae spinalis

例句：

1. 1. The apex of the spine is where the nerves converge to regulate our body's movement.
   脊柱的顶点是神经汇聚的地方，用来调节我们的身体运动。
2. 2. The cornus of the skull protects the brain from injury during impact.
   颅骨的角质层在冲击时保护大脑免受伤害。
3. 3. The posterior part of the medullary cavity contains the spinal cord, which controls all the muscles in the body.
   髓腔的后部包含脊髓，它控制着身体的所有肌肉。