The central sinus is a small elongated non-contractile sinus situated in the proboscis just above the buccal diverticulum.It is a closed triangular cardiac sac or heart vesicle. Its ventral wall is muscular and contracts rythmically thereby producing pulsation in the central sinus that help in the circulation of blood.The central sinus receives blood from collecting vessels that opens into its posterior end. It pumps its blood into several afferent vessels which form a plexus in the proboscis gland or glomerulus, lying in front of it. In glomerulus the blood gets rid of its excretory wastes.
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