The spiral valve alternately blocks & unblocks the entrances to the left and right pulmonary arches (sending unoxygenated blood to the skin & lungs). [ http://people.eku.edu/ritchisong/342notes9.html ]
This is just here as a test because I lose it
Term information
taxon notes
found in dipnoans and amphibians
The spiral valve is considered to have evolved from the right member of the four embryonic endocardial ridges (Goodrich, 1930 - via Morris 1974)
Term relations
Subclass of:
- valve
- mesoderm-derived structure
- in taxon some Sarcopterygii
- in taxon some (not Amniota)
- part of some conus arteriosus