29 Questions
Which chamber forms the right border of the heart?
Right atrium
What does the right auricle do?
Increases the capacity of the atrium
Which part of the right atrium is smooth and thin-walled?
Posterior part
What type of muscles make up the rough, muscular anterior wall of the right atrium?
Pectinate muscles
Through which orifice does the right atrium discharge poorly oxygenated blood into the right ventricle?
Right AV orifice
Which structure separates the smooth and rough parts of the atrial wall externally?
Sulcus terminalis
Where does the inferior vena cava open into the right atrium?
At the level of the 5th costal cartilage
What is the function of the coronary sinus?
Receives most of the cardiac veins
What is the oval fossa a remnant of?
Oval foramen
Where does the superior vena cava open into the right atrium?
At the level of the 3rd costal cartilage
Which part of the heart do pectinate muscles primarily mark?
Right atrium
Which chamber forms the largest part of the anterior surface of the heart?
Right ventricle
What is the name of the arterial cone that tapers superiorly from the right ventricle?
Conus arteriosus
What separates the ridged muscular wall of the inflow part of the right ventricle from the smooth wall of the outflow part?
Supraventricular crest
Through which orifice does the right atrium receive blood from the right atrium?
Right AV (tricuspid) orifice
Where is the right AV orifice located?
At the level of the 4th and 5th intercostal spaces
Which structure prevents the cusps of the tricuspid valve from prolapsing into the right atrium during ventricular systole?
The tendinous cords
What do the papillary muscles do before contraction of the right ventricle?
They tighten the tendinous cords
What is the function of the tricuspid valve?
To prevent regurgitation of blood from the right ventricle back into the right atrium
What attaches to the free edges and ventricular surfaces of the cusps of the tricuspid valve?
The chordae tendineae
Which muscle arises from the anterior wall of the right ventricle and attaches to the anterior and posterior cusps of the tricuspid valve?
Anterior papillary muscle
Which muscle arises from the inferior wall of the right ventricle and attaches to the posterior and septal cusps of the tricuspid valve?
Posterior papillary muscle
Which muscle arises from the interventricular septum and attaches to the anterior and septal cusps of the tricuspid valve?
Septal papillary muscle
Which part of the interventricular septum forms the majority of the septum and has the thickness of the left ventricle wall?
Muscular part
Which part of the interventricular septum is a thin membrane that forms the smaller membranous part of the septum?
Membranous part
Which structure deflects the incoming flow into the main cavity of the ventricle and the outgoing flow into the conus arteriosus toward the pulmonary orifice?
Supraventricular crest
Where is the pulmonary valve located?
At the apex of the conus arteriosus
What is the name of the arterial cone that tapers superiorly from the right ventricle?
Conus arteriosus
At what level is the pulmonary valve located?
Left 3rd costal cartilage
Test your knowledge of the anatomy and function of the right atrium in the heart. Learn about its structure, blood flow, and unique features.
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