human_reference_atlas Homo sapiens intercostal muscle innermost intercostal muscle musculus intercostalis intimus Wikipedia:Innermost_intercostal_muscle SCTID:368054008 uberon innermost intercostal muscle UBERON:0008617 innermost intercostal muscle AS FMA:9758 The Innermost intercostal muscle is a layer of intercostal muscle beneath the intercostal nerves and internal intercostal muscles. These are divided into transversus thoracis anteriorly, lateral muscle slips laterally and subcostalis posteriorly. thoracic wall muscle