1. 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
   "The serratus posterior inferior is involved in forced expiration"

Derived forms: serratus posterior inferiors

Type of: musculus serratus posterior, posterior serratus muscle, serratus posterior

Encyclopedia: Serratus posterior inferior