Internal intercostal muscles

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Internal intercostal muscles
Internal intercostal muscles (red) seen from back.
Details
Origin	Rib - superior border
Insertion	Rib - inferior border
Artery	Intercostal arteries
Nerve	Intercostal nerves
Actions	Hold ribs steady
Antagonist	External intercostal muscles
Identifiers
Latin	musculi intercostales interni
TA98	A04.4.01.013
TA2	2312
FMA	74085
Anatomical terms of muscle [edit on Wikidata]

The internal intercostal muscles (intercostales interni) are a group of skeletal muscles located between the ribs. They are eleven in number on either side. They commence anteriorly at the sternum, in the intercostal spaces between the cartilages of the true ribs, and at the anterior extremities of the cartilages of the false ribs, and extend backward as far as the angles of the ribs, hence they are continued to the vertebral column by thin aponeuroses, the posterior intercostal membranes. They pull the sternum and ribs upward and inward.