External intercostal muscle 12
Musculus intercostalis externus XII
Draws each rib forward and outward on the one in front, enlarging the chest in inspiration.
About the external intercostal muscle 12 of the horse
External intercostal muscle 12 is a muscle of the body (trunk), one on each side of the body. Its name in the Nomina Anatomica Veterinaria is Musculus intercostalis externus XII. You can turn it above, see it in place in the body of the horse, and open it inside the whole animal in Vetomica.
Where it runs from and to
A muscle is told apart from its neighbours by what it takes hold of at each end, which is also what decides what it does when it shortens.
- Origin
- The caudal border of a rib.
- Insertion
- The cranial border of the rib behind it, the fibres running caudoventrally.
- Action
- Draws each rib forward and outward on the one in front, enlarging the chest in inspiration.
- Nerve
- The intercostal nerves (ventral branches of the thoracic nerves).
Written for Vetomica in its own words from the standard reference anatomy of the horse; the books it was checked against are listed below.
Terminology
- English
- External intercostal muscle 12
- Latin (NAV)
- Musculus intercostalis externus XII
- Status
- A valid term in the Nomina Anatomica Veterinaria
Questions about the external intercostal muscle 12
- What is the Latin name of the external intercostal muscle 12?
- In the Nomina Anatomica Veterinaria, the external intercostal muscle 12 is called Musculus intercostalis externus XII.
- Where is the external intercostal muscle 12 of the horse?
- External intercostal muscle 12 is a muscle of the body (trunk), one on each side of the body.
- Where does the external intercostal muscle 12 originate and insert?
- Origin: The caudal border of a rib. Insertion: The cranial border of the rib behind it, the fibres running caudoventrally.
- What nerve supplies the external intercostal muscle 12?
- The intercostal nerves (ventral branches of the thoracic nerves).
- What does the external intercostal muscle 12 do?
- Draws each rib forward and outward on the one in front, enlarging the chest in inspiration.
See the external intercostal muscle 12 inside the whole horse.
Vetomica opens on this structure with every layer of the horse around it: peel back the skin and the muscles, cut a section through it, X-ray it, and practise naming it until you stop getting it wrong.
Free for 7 days, no card. After that the skeletons stay free.
