Contents
- 1 What is muscular Pectinati?
- 2 What is the function of musculi pectinati in the right atrium?
- 3 Where is the Crista terminalis located?
- 4 What is the difference between trabeculae carneae & pectinate muscles?
- 5 Is there trabeculae carneae in right atrium?
- 6 Where is the right ventricle?
- 7 What are the types of trabeculae carneae?
What is muscular Pectinati?
The pectinate muscles are “teeth of a comb” shaped parallel muscular columns that are present on the inner wall of the right and left atria. The right atrium has thick and coarse pectinate muscles while these are few smooth and thinner in the left atrium.
What is the function of musculi pectinati in the right atrium?
The atrial infolding increases the surface area of atrial chamber at times of dilatation , like the music instrument . So, these macro folds ( like intestinal villi ) help overcome the constantly changing volume status of right atrium.
What is the use of musculi pectinati?
This is due to the embryological origin of the auricles, which are the true atria. Some sources cite that the musculi pectinati are useful in increasing the power of contraction without increasing heart mass substantially.
Where is the Crista terminalis located?
right atrium
The crista terminalis (or terminal ridge) is a ridge of myocardium within the right atrium that extends along the posterolateral wall of the right atrium between the orifice of the superior vena cava to the orifice of the inferior vena cava (IVC).
What is the difference between trabeculae carneae & pectinate muscles?
The trabeculae carneae (columnae carneae, or meaty ridges), are rounded or irregular muscular columns which project from the inner surface of the right and left ventricles of the heart. The pectinate muscles (musculi pectinati) are parallel ridges in the walls of the atria of the heart.
Which side of the heart delivers deoxygenated blood?
The left side of the heart receives oxygenated blood from the pulmonary vein and pumps it into the aorta, while the right side of the heart receives deoxygenated blood from the vena cava and pumps it into the pulmonary vein.
Is there trabeculae carneae in right atrium?
The trabeculae carneae (columnae carneae, or meaty ridges), are rounded or irregular muscular columns which project from the inner surface of the right and left ventricle of the heart. These are different from the pectinate muscles, which are present in the atria of the heart.
Where is the right ventricle?
The right ventricle is one of the heart’s four chambers. It is located in the lower right portion of the heart below the right atrium and opposite the left ventricle.
Is Crista terminalis in left atrium?
On the external aspect of the right atrium, corresponding to the crista terminalis is a groove, the terminal sulcus….
| Crista terminalis | |
|---|---|
| Interior of the heart, frontal view (crista terminalis labeled on the left, second from the top) | |
| Details | |
| Identifiers | |
| Latin | Crista terminalis atrii dextri |
What are the types of trabeculae carneae?
They are of three kinds: some are attached along their entire length on one side and merely form prominent ridges, others are fixed at their extremities but free in the middle, while a third set (musculi papillares) are continuous by their bases with the wall of the ventricle, while their apices give origin to the …