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| Intercostales externi muscle | |
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| Deep muscles of the chest and front of the arm, with the boundaries of the axilla. (Intercostalis externus labeled at bottom center.) | |
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| The Obliquus internus abdominis. (Intercostalis externus labeled at top center.) | |
| Latin | musculi intercostales externi |
| Gray's | subject #117 403 |
| Origin | |
| Insertion | |
| Artery | intercostal arteries |
| Nerve | intercostal nerves |
| Action | Inhalation |
| Antagonist | intercostales interni muscles |
The Intercostales externi (External intercostals) are eleven in number on either side.
They extend from the tubercles of the ribs behind, to the cartilages of the ribs in front, where they end in thin membranes, the anterior intercostal membranes, which are continued forward to the sternum.
Each arises from the lower border of a rib, and is inserted into the upper border of the rib below. In the two lower spaces they extend to the ends of the cartilages, and in the upper two or three spaces they do not quite reach the ends of the ribs.
They are thicker than the Intercostales interni, and their fibers are directed obliquely downward and lateralward on the back of the thorax, and downward, forward, and medialward on the front.
Continuation with the Obliquus externus or Serratus anterior: A Supracostalis muscle, from the anterior end of the first rib down to the second, third or fourth ribs occasionally occurs.
 A central rib of the left side. Inferior aspect. |
 Diagram of the course and branches of a typical intercostal nerve. |
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
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