part of part of innervated by innervated_by in taxon develops from develops from composed primarily of immediate transformation of Mammalia Aves thoracic segment of trunk respiratory system diaphragm UBERON:0001103 Wikipedia:Thoracid_diaphragm BTO:0000341 SCTID:181614006 diaphragm muscle phren thoracic diaphragm MESH:D003964 NCIT:C12702 diaphragm of thorax The diaphragm is a skeletal muscle that is responsible for contraction and expansion of the lungs[GO]. The mammals are characterized by a diaphragm, which separates the thoracic portion of the body cavity from the abdominal region and assists in drawing air into the lungs and forcing it out. Modern reptiles lack a muscular diaphragm and it is reasonable to suppose that the diaphragm developed as a new device that made possible a large degree of oxygen intake for active animals. The change may have taken place during the transition from reptile to mammal (...).[well established][VHOG] phrenic EV:0100376 GAID:158 The urochordate epicardium separates digestive organs from the pharynx and heart, but the anus returns to the upper compartment to discharge wastes through an outgoing siphon (Thoracic_diaphragm#Comparative_anatomy_and_evolution) EFO:0000937 MAT:0000502 A thin musculomebranous barrier that separates the abdominal and thoracic cavities. Often used for breathing control. The existence of some membrane separating the pharynx from the stomach can be traced widely among the chordates. Thus amphioxus possesses an atrium by which water exits the pharynx, which has been argued (and disputed) to be homologous to structures in ascidians and hagfishes.[3] EMAPA:17701 midriff UMLS:C0011980 breathing control originate from the cervical somites, likely C3-C5[PMID:23586979] MA:0001904 VHOG:0000713 EHDAA2:0003495 CALOHA:TS-0198 FMA:13295 barrier between thoracic and abdominal cavities; stop gastric contents from refluxing into the oesophagus skeletal muscle tissue phrenic nerve thoracic segment muscle respiratory system muscle future diaphragm