Abomasum (also known as Abomasums): The fourth stomach of ruminating animals. It is also called the true stomach. It is an elongated pear-shaped sac lying on the floor of the abdomen, on the right-hand side, and roughly between the seventh and twelfth ribs. It leads to the beginning of the small intestine. (From Black'

NIH MeSH · D000018Anatomy

Abomasum

Also known asAbomasums

Definition

The fourth stomach of ruminating animals. It is also called the true stomach. It is an elongated pear-shaped sac lying on the floor of the abdomen, on the right-hand side, and roughly between the seventh and twelfth ribs. It leads to the beginning of the small intestine. (From Black's Veterinary Dictionary, 17th ed)

MeSH classification

  • A13.869.106

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Common questions about Abomasum

What does Abomasum mean in medicine?
The fourth stomach of ruminating animals. It is also called the true stomach. It is an elongated pear-shaped sac lying on the floor of the abdomen, on the right-hand side, and roughly between the seventh and twelfth ribs. It leads to the beginning of the small intestine. (From Black's Veterinary Dictionary, 17th ed) This definition is taken from the National Library of Medicine's MeSH (Medical Subject Headings) 2026 release, which is the standard vocabulary used to index PubMed and most medical literature.
Is Abomasum known by any other names?
Yes. Abomasum is also referred to as Abomasums in different clinical, research and patient-facing contexts. The MeSH descriptor groups all of these synonyms under a single canonical concept so research and records stay consistent.
Where does Abomasum sit in the medical classification?
Abomasum falls under the broader medical category "Anatomy" in the MeSH hierarchy (tree numbers: A13.869.106). Browsing the related concepts on this page takes you to neighbouring topics in the same branch of medicine.
Where can I get a plain-language explanation of Abomasum?
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Source: NIH MeSH 2026 (D000018) — National Library of Medicine, public domain. View official MeSH record ↗