Nerve intercostal nerves Latin musculus subcostalis | Actions depresses ribs. Dorlands
/Elsevier m_22/12551003 | |
Origin inner surface of one rib Insertion inner surface of the second or third rib below, near its angle | ||
The Subcostales (singular: subcostalis) (Infracostales) consist of muscular and aponeurotic fasciculi, which are usually well-developed only in the lower part of the thorax; each originates from the inner surface of one rib, and is inserted into the inner surface of the second or third rib below, near its angle.
Their fibers run in the same direction as those of the Intercostales interni.
The function of this muscle is unknown, but it is part of the innermost intercostal muscle group along with the transversus thoracis muscle which is known to be a synergist in aiding the internal intercostal muscles with forced exhalation.
References
Subcostalis muscle Wikipedia(Text) CC BY-SA