Corpus: Intercostales externi muscles
Achtung: Du siehst nicht die aktuelle, sondern eine ältere Version dieser Seite.
This text has been translated by an AI and may sound raw. It will be reviewed shortly. Thank you for your patience!
This text has been translated by an AI and may sound raw. It will be reviewed shortly. Thank you for your patience!
1. Definition
The Musculi intercostales externi are part of the autochthonous pectoral musculature, forming the superficial layer of the intercostal muscles.
2. Anatomy
The Musculi intercostales externi originate from the lower edge of the 1st to the 11th rib, extending from the costal tuberosity to the cartilage-bone junction. The external intercostal membrane, an aponeurosis, corresponds to the muscles between the costal cartilages. The muscle fibers run obliquely from the dorsal-cranial direction to the ventral-caudal direction, mirroring the fiber orientation of the obliquus externus abdominis muscle. These muscles insert along the upper edges of the 2nd to the 12th rib.
3. Innervation
The Musculi intercostales externi are innervated by the intercostal nerves 1-11.
4. Function
As part of the respiratory musculature, the Musculi intercostales externi support inspiration. When contracted, they tense the adjacent intercostal spaces, leading to an increase in the volume of the bony thorax, thus aiding in the process of breathing.