Duodenum - duodenum, twelve; so named because it is 12 fingerbreadths in length.⏎
Diaphragm - diaphragma, partition.⏎
Fossa - fossa, trench or ditch, hence any concavity.⏎
Chordae tendineae - corda, string; tendin, stretched.⏎
Concha - conche, cockleshell.⏎