The transpyloric plane, also known as Addison's plane, is an imaginary axial plane located midway between the jugular notch and superior border of pubic symphysis, at approximately the level of L1 vertebral body. It an important landmark as many key structures are visualised at this level, although natrurally there is anatomical variation. The structures traditionally thought of as lying in the transpyloric plane include:
- pylorus of the stomach
- D1 part of the duodenum
- duodeno-jejunal flexure
- root of the transverse mesocolon
- hepatic flexure of the colon
- splenic flexure of the colon
- fundus of the gallbladder
- neck of the pancreas
- hila of the kidneys
- hilum of the spleen
- ninth costal cartilage
- termination of spinal cord and superior portion of conus medullaris
- origin of superior mesenteric artery
- splenic vein joins superior mesenteric vein to form portal vein
- cisterna chyli
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