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。
Objective: To investigate the regular pattern of development of nephron thin segment in mice.
目的：探讨小鼠肾脏髓襻细段发生发育及逐渐成熟过程。
Objective: To investigate the regular pattern of development of nephron thin segment in mice.
目的：探讨小鼠肾脏髓襻细段发生发育及逐渐成熟过程。
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