The isthmus, or pars interarticularis, is a small, thin segment of bone that connects the facet joints at the back of the spine.
峡部或称椎弓峡部，是脊柱背侧连接上下关节突之间的一段小而细的骨段。
The isthmus, or pars interarticularis, is a small, thin segment of bone that connects the facet joints at the back of the spine.
峡部或称椎弓峡部，是脊柱背侧连接上下关节突之间的一段小而细的骨段。
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