pectoral complex muscle m. serratus inferior Muscle which originates as a posterior and anterior head. The posterior head originates from the transverse process and cartilaginous epiphysis of presacral vertebra IV. The anterior head originates on the same parts of presacral vertebrae III. Both insert on the medial surface of the suprascapula near its postero-ventral edge. UBERON:3010699 This class was sourced from an external ontology (amphibian_anatomy). Its definitions, naming conventions and relationships may need to be checked for compatibility with uberon