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What is the purpose of auricles in the atria?
What is the purpose of auricles in the atria?
- Facilitate blood flow into the ventricles
- Separate the right and left atria
- Increase the atrial volume somewhat (correct)
- Contain pectinate muscles
What distinguishes the internal structure of the right atrium from that of the left atrium?
What distinguishes the internal structure of the right atrium from that of the left atrium?
- Presence of pectinate muscles in the entire right atrium
- Anterior portion of the left atrium forms ridges in the walls
- Left atrium has a terminal crest separating posterior and anterior regions
- The smooth wall posterior part of the right atrium (correct)
What separates the posterior and anterior regions of the right atrium?
What separates the posterior and anterior regions of the right atrium?
- Pectinate muscles
- Frista terminalis (correct)
- Auricles
- Fossa ovalis
In which atrium are pectinate muscles found only in the auricle?
In which atrium are pectinate muscles found only in the auricle?
What marks the spot where an opening called foramen ovale existed in the fetal heart?
What marks the spot where an opening called foramen ovale existed in the fetal heart?
What is the function of pectinate muscles in the right atrium?
What is the function of pectinate muscles in the right atrium?
Which term describes the small, wrinkled appendages that increase atrial volume?
Which term describes the small, wrinkled appendages that increase atrial volume?
What structure separates the posterior and anterior regions of the right atrium?
What structure separates the posterior and anterior regions of the right atrium?
Where are pectinate muscles predominantly found in the heart?
Where are pectinate muscles predominantly found in the heart?
What marks the spot where an opening, the foramen ovale, existed in the fetal heart?
What marks the spot where an opening, the foramen ovale, existed in the fetal heart?
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Study Notes
Auricles and Atria
- Auricles serve to increase the capacity of the atria, allowing for greater volume of blood to accommodate filling.
- Pectinate muscles are primarily situated in the auricles, contributing to the superior part of atrial walls, enhancing contraction effectiveness.
Structural Differences between Atria
- The internal structure of the right atrium includes pectinate muscles throughout, while the left atrium contains them only in the auricle.
- The interatrial septum distinguishes the left atrium from the right atrium, separating the two chambers.
Regions of the Right Atrium
- The sinus venarum and the right auricle differentiate the posterior and anterior regions of the right atrium, respectively.
- Crista terminalis is the muscular ridge that marks the transition between the two regions within the right atrium.
Fetal Heart Reference Point
- The fossa ovalis indicates where the foramen ovale was located in the fetal heart, a vital structure for blood circulation in prenatal development.
Functions of Structures in the Right Atrium
- Pectinate muscles in the right atrium assist cardiac contractions, aiding in efficient blood flow into the ventricles.
- The crista terminalis also plays a role in distinguishing the smooth-walled sinus venarum and the irregular trabeculated auricle.
Appendages of the Atria
- Auricles are small, wrinkled appendages that expand atrial volume and enhance the heart’s ability to gather and store blood.
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