Veterinary Splanchnology and Applied Anotomy

INTERIOR STOMACH - RUMEN

• The cavity of the rumen is divided into two sacs by the pillars of the rumen, which are muscular folds and correspond to the grooves on the exterior
• They project like shelves into the cavity of the organ. The cranial pillar has a thick concave free edge
• Between these free edges, the two sacs of rumen communicate with each other
• The right and left pillars connect the cranial and caudal pillars and are less prominent
• The rumino-reticular fold corresponds to the rumino-reticular groove. Its free edge is concave and forms the ventral and lateral margins of the large oval rumino-reticular aperture
• The cardia is about 10 to 12 cm ventral to the vertebral end of the 8th or 9th rib. The opening is slit-like
• The mucous membrane is brown in colour except on the pillars where it is pale
• It is thickly studded with papillae which are however not present on the pillars.