It is a large median longitudinal artery extending forward from sinus venosus. It is mid-ventrally in the wall of pharynx below the endostyle in the subendostylar coelom, also called as subendostylar aorta. Blood flows in it anteriorlydue to rhythmic contractions of its muscular walls. The ventral aorta gives off a series of a paired lateral afferent branchial arteries . The afferent vessels leave the pharynx the pharynx dorsally as in the form of efferent branchial vessels which opens into a lateral dorsal aorta of that sac. The vessels splits into a small capillary network the nephric glomerular sinus or glomus in relation with a nephridium.
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