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Circulatory Anatomy
Ventral Aorta
Aorta ventralis
The main artery leaving the heart, carrying deoxygenated blood forward to branch into the gills for oxygen loading.
Region: Head Universal in fish Unique to: all
📖 Overview
The ventral aorta is the fish equivalent of the pulmonary trunk in mammals. Blood pumped from the ventricle enters the ventral aorta and branches into four to six pairs of afferent branchial arteries, which distribute deoxygenated blood to each gill arch for oxygenation.
🧬 Structure
A single midline vessel extending forward from the bulbus (or conus) arteriosus of the heart to the base of the gill arches.
⚙️ Function
Distributes deoxygenated systemic blood into the gill vasculature for gas exchange.
✨ Fun Fact
In tuna and other high-performance pelagic fish, the ventral aorta walls contain elastin at concentrations approaching mammalian arterial walls - a convergent solution to sustained high blood pressure.
🔗 Related Circulatory Structures