serratus posterior inferior

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Related to serratus posterior inferior: Quadratus lumborum
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Noun1.serratus posterior inferior - a thin quadrilateral muscle at the junction of the thoracic and lumbar regions; acts to counteract the pull of the diaphragm on the ribs to which it is attached
musculus serratus posterior, posterior serratus muscle, serratus posterior - skeletal muscle that draws the rib cage backward and downward
References in periodicals archive ?
It is an inverted triangle the base of which is formed by the 12th rib and the lower edge of serratus posterior inferior muscle, anteriorly bounded by the posterior border of internal oblique muscle, posteriorly bounded by the anterior border of sacrospinalis muscle.
The boundaries of the superior triangle are the posterior border of the internal oblique muscle anteriorly, the anterior border of the sacrospinalis posteriorly, the twelfth rib, and the serratus posterior inferior muscle superiorly.