Each nerve leaves the spinal canal through the corresponding intervertebral foramen, which are openings between two adjacent vertebrae.

所有神经均通过相应的椎间孔离开椎管；椎间孔开口于两块相邻椎体之间。

Another cause of nerve compression is spinal stenosis, which is the narrowing of the spinal canal or intervertebral foramen.

神经受压迫的另一个原因是椎管狭窄，即椎管或椎间孔的狭窄。

It's formed by the spinal nerves L4, L5 and S1, 2 and 3, which leave the spinal canal through the intervertebral foramen, an opening located between the vertebrae and behind intervertebral discs.

它是由脊神经腰4（L4）、腰5（L5）、骶1（S1）、骶2（S2）和骶3（S3）组成；这些神经通过椎间孔离开椎管；椎间孔为椎骨之间、椎间盘后方的椎管的开口。