Papillary process

The papillary process is a subdivision of the caudate lobe of the liver.

The caudate lobe is located adjacent to the lesser curvature of the stomach and is typically divided into two parts:

• Caudate process: projects toward the right kidney.

• Papillary process: projects toward the lesser curvature of the stomach, often overlying the lesser omentum.

The papillary process is a small, tongue-like projection that extends into the lesser omentum near the esophageal hiatus and is usually more prominent in certain species.

Species Variations

• Dog (Canis lupus familiaris):

  • The papillary process is well-developed.

  • It lies adjacent to the lesser curvature of the stomach and contributes to the wall of the omental bursa.

  • It can be seen extending medially between the left and quadrate lobes.

• Cat (Felis catus):

  • Similar to the dog, the papillary process is present and prominent.

  • It is also medial and visible on the visceral surface.

• Horse (Equus caballus):

  • The caudate lobe is undivided; the papillary process is absent.

  • This species shows the least subdivision of the liver lobes.

• Ox (Bos taurus):

  • The papillary process is usually absent or very rudimentary.

  • The caudate lobe mainly consists of a large caudate process.

• Pig (Sus scrofa domestica):

  • The papillary process is generally absent.

  • The liver has a more compact and consistent lobulation, with limited subdivision.

• Sheep and Goat (Ovis aries, Capra hircus):

  • The papillary process is poorly developed or absent.

  • The liver is similar in structure to that of the ox.