The outer fibrous ring, called the annulus fibrous, and inner gel-like pulp, called the nucleus pulposus.

外层为纤维环；内层为髓核，呈胶状。

In some cases, the nucleus macrophages attack the nucleus pulposus, and start secreting inflammatory cytokines, like tumor necrosis factor alpha, an interleukin-1, and interleukin-6.

在某些情况下，巨噬细胞会攻击髓核，并分泌炎性因子，比如肿瘤坏死因子α（TNF-α）、白细胞介素-1（IL-1）和白细胞介素-6（IL-6）。