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Intercostal muscles | ||
---|---|---|
Deep muscles of the chest and front of the arm, with the boundaries of the axilla. | ||
Gray's | subject #117 403 | |
Origin: | ribs 1-11 | |
Insertion: | ribs 2-12 | |
Blood: | intercostal arteries | |
Nerve: | intercostal nerves | |
Action: | ||
MeSH | A02.633.567.900.500 |
Intercostal muscles are several groups of muscles that run between the ribs, and help form and move the chest wall.
There are three principal layers;
- the external intercostal muscles, which aid in quiet and forced inhalation. They originate on ribs 1-11 and have their insertion on ribs 2-12. The external intercostals are responsible for the elevation of the ribs, and expanding the transverse dimensions of the thoracic cavity.
Located around the the ribs
- the internal intercostal muscles, which aid in forced expiration (quiet expiration is a passive process). They originate on ribs 1-11 and have their insertions on ribs 2-12. The internal intercostals are responsible for the depression of the ribs decreasing the transverse dimensions of the thoracic cavity.
- the innermost intercostal muscle
Both the external and internal muscles are innervated by the intercostal nerves (=ventral rami of thoracic spinal nerves), and are provided by the intercostal arteries and intercostal veins. Their fibers run in opposite directions.
Other intercostal muscles[]
Besides the scaleni, who also move the chest wall and have a function in inhalation, other intercostal muscles are:
- Subcostal muscles
- Transversus thoracis muscle
External links[]
List of muscles of torso | |
---|---|
BACK |
splenius (capitis, cervicis) - erector spinae (iliocostalis, longissimus, spinalis) - latissimus dorsi |
SUBOCCIPITAL |
rectus capitis posterior (major, minor) - obliquus capitis (inferior, superior) |
CHEST |
intercostales (external, internal, innermost) - subcostales - transversus thoracis - levatores costarum - serratus posterior (inferior, superior) - diaphragm |
ABDOMEN |
obliques (external, internal) - transversus abdominis - rectus abdominis - pyramidalis - cremaster - quadratus lumborum |
PELVIS/FLOOR |
levator ani (iliococcygeus, pubococcygeus, puborectalis) - coccygeus |
PERINEUM |
sphincter ani (externus, internus) superficial perineal pouch (transversus perinei superficialis, bulbospongiosus, ischiocavernosus) deep perineal pouch (transversus perinei profundus, sphincter urethrae membranaceae) |
- pl:Mięśnie międzyżebrowe
- pt:Músculo intercostal
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