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[[Image:Highland Cow.jpg|thumb|right|150px|Ruminant picture - Copyright nabrown RVC]]

[[Image:Highland Cow.jpg|thumb|right|150px|Ruminant picture - Copyright nabrown RVC]]

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The ruminant stomach occupies most of the left hand side of the abdomen. It is a vast structure, holding up to 60 litres in an adult cow. The rumen holds 80%, reticulum 5%, omasum 8% and abomasum 7% in larger ruminants. In smaller ruminants the proportions are slightly different, with the rumen holding 75%, reticulum 8%, omasum 4% and abomasum 13%.

The ruminant stomach occupies most of the left hand side of the abdomen. It is a vast structure, holding up to 60 litres in an adult cow. The rumen holds 80%, reticulum 5%, omasum 8% and abomasum 7% in larger ruminants. In smaller ruminants the proportions are slightly different, with the rumen holding 75%, reticulum 8%, omasum 4% and abomasum 13%.

The different compartments of the ruminant stomach develop from the foregut spindle in foetal life. During embryogenesis and after birth the [[Abomasum - Anatomy & Physiology|abomasum]] is the largest of the compartments (over half of the weight and capacity of the four stomachs) due to the [[Oesophageal Groove|oesophageal groove]] directing milk from the oesophagus to the [[Rumen - Anatomy & Physiology|rumen]] into the abomasum, bypassing the [[Reticulum - Anatomy & Physiology|reticulum]].

The different compartments of the ruminant stomach develop from the foregut spindle in foetal life. During embryogenesis and after birth the [[Abomasum - Anatomy & Physiology|abomasum]] is the largest of the compartments (over half of the weight and capacity of the four stomachs) due to the [[Oesophageal Groove|oesophageal groove]] directing milk from the oesophagus to the abomasum, bypassing the rumen, reticulum and omasum.

==Physiology==

==Physiology==

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[[Category:Stomach - Anatomy & Physiology]]

[[Category:Stomach - Anatomy & Physiology]]

[[Category:Alimentary Anatomy - Cattle]]

[[Category:Alimentary Anatomy - Cattle]]

[[Category:A&P Done]]

[[Category:A&P Done]]