Chambers of the Heart Flashcards
What does the right atrium receive deoxygenated blood from?
SVC, IVC and coronary veins
In anatomical position, what does right atrium form?
Right border of heart
What can interior surface of right atrium be divided into?
Rough and smooth –> sinus venarum and atrium proper
What are the rough and smooth parts of the right atrium separated by?
Muscular ridge –> Crista terminalis
What is the smooth part of the right atrium?
Sinus venarum (located posterior to Crista terminalis) - Receives blood from SVC and IVC
What is the sinus venarum derived from?
Embryonic sinus venosus (right horn that is absorbed by right atrial wall)
What is the rough part of the right atrium?
Atrium proper (anterior to crista terminalis)
What are the rough, muscular walls of the atrium proper formed by?
Pectinate muscles
What is the atrium proper derived from?
Primitive atrium
What separates the left and right atria?
Interatrial septum (solid muscular wall)
What is the small depression in the septal wall in the right atrium?
Fossa ovalis
Where doe the left atrium receive oxygenated blood from?
4 pulmonary veins
In the anatomical position, what does the left atrium form?
The posterior border of the heart
What can the interior surface of the left atrium be divided into?
- Inflow portion (smooth)
2. Outflow portion (rough)
Describe the inflow portion of the left atrium
- Receives blood from pulmonary veins
- Surface is smooth and derived from pulmonary veins themselves
Describe the outflow portion of the left atrium
- Located anteriorly
- Includes left auricle
- Lined by pectinate muscles (rough)
Where is the outflow portion of the left atrium derived from?
Embryonic atrium
In the anatomical position, what does the right ventricle form?
Majority of anterior border of the heart
What can the right ventricle be divided into?
Inflow and outflow portion
What is the inflow and outflow portion of the right ventricle separated by?
Muscular ridge (supraventricular crest)
Describe the interior surface of inflow part of right ventricle
Covered by series of irregular muscular elevations called trabeculae carnae (sponge-like appearance)
Where can the trabeculae carnae be found?
Inflow part of left and right ventricle
What can trabeculae carnae be grouped into?
- Ridges
- Bridges (moderator band)
- Pillars (papillary muscles)
What is the outflow portion of the right ventricle called?
Conus arteriosus
Describe the conus arteriosus
- Leading to the pulmonary artery
- Located in superior aspect of ventricle
- Smooth walls (no trabeculae carnae)
Where is the conus arteriosus derived from?
Embryonic bulbus cordis
In the anatomical position, what does the left ventricle form?
The apex of the heart, as well as the left and right diaphragmatic borders
What can the left ventricle be separated into?
Inflow and outflow portion
Describe the inflow portion of the left ventricle
- Rough (lined by trabeculae carnae)
- 2 papillary muscles attached to cusps of mitral valve
What is the outflow portion of the left ventricle called?
Aortic vestibule
Describe the aortic vestibule
- Leading to aorta
- Smooth wall (no trabeculae carnae)
Where is the aortic vestibule derived from?
Embryonic bulbus cordis
What is the sinus venarum?
Smooth (posterior) part of right atrium
What is the atrium proper?
Rough (anterior) part of right atrium
What is the aortic vestibule?
Smooth outflow part of left ventricle
What is the conus arteriosus?
Smooth outflow part of right ventricle
Where is the rough part of the left ventricle derived from?
Primitive ventricle
Where is the rough part of the right ventricle derived from?
Primitive ventricle
