- anterior p. of left medial segment IV of liver [TA] the part of the medial segment of the liver that includes the quadrate lobe. SYN: quadrate part of liver [TA], pars quadrata hepatis.
- mesenteric p. of small intestine the freely movable p. of the small intestine supplied with a mesentery, comprising the jejunum and ileum. SYN: intestinum tenue mesenteriale.
- subcutaneous p. of external anal sphincter SYN: subcutaneous part of external anal sphincter. See external anal sphincter.
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por·tion (porґshən) a part or division of a larger structure; called also portio [TA], part, and pars.Medical dictionary. 2011.