There are 2 embryologic hypotheses for annular pancreas.One indicates a process of fixation of the tip of the entral pancreatic bud to the duodenum before the axis rotation.

• 关于环状胰腺的胚胎学说有2个，一种学说认为在胚胎发育过程中，在轴旋转前腹侧胰始基尖端已固定于十二指肠。