Outflow tract septation and the aortic arch system in reptiles: lessons for understanding the mammalian heart

Table 2 Summary of principal differences

	Lizard	Turtle	Crocodile	Bird	Mammal
Short left visceral aorta	✓	✓	✓	×^a	×
Short right systemic aorta	✓	✓	✓	✓	×
Long aortic trunk, bifurcating	×	×	×	×	✓
Unseptated outflow tract	✓	✓	×	×	×
Completely septated ventricles	×	×	✓^a	✓	✓
Parietal OFT cushion in conus	×	×^b	✓	✓	✓
SHF in PAA4 and PAA6 flow divider	✓	✓	✓	×^b	✓
AP septal complex	×	×	×	✓^c	✓^d
NCC in muscular AP septum	×	×	✓^e	✓	✓
NCC (TFAP2α) in PAA3	×	✓	✓^f	nd	nd
Foramen of Panizza (FOP)	×	×	✓^g	×	×

ISSN: 2041-9139