Sinus venosus

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Sinus Venosus

The Sinus Venosus (pronunciation: /ˈsaɪnəs vɪˈnoʊsəs/) is a significant part of the cardiovascular system in the early stages of embryonic development.

Etymology

The term "Sinus Venosus" is derived from Latin, where "sinus" means "bay" and "venosus" means "veiny" or "full of veins".

Definition

The Sinus Venosus is an embryonic heart chamber found in the developing heart of vertebrates. It is initially a paired structure but later becomes unpaired and serves as the primary input to the heart, receiving blood from the umbilical vein, vitelline vein, and the common cardinal vein.

Function

The Sinus Venosus plays a crucial role in the development of the heart. It helps in the formation of the sinoatrial node, the natural pacemaker of the heart. It also contributes to the formation of the coronary sinus and the smooth part of the right atrium.

Related Terms

  • Sinoatrial Node: The natural pacemaker of the heart that originates from the Sinus Venosus.
  • Coronary Sinus: A collection of veins joined together to form a large vessel that collects blood from the myocardium of the heart.
  • Smooth Part of the Right Atrium: The posterior section of the right atrium of the heart, derived from the embryonic Sinus Venosus.

External links

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