What is crista terminalis?
The crista terminalis is a smooth ridge of tissue that begins at the roof of the right atrium anterior to the superior vena cava orifice and extends inferiorly to the anterior lip of the inferior vena cava.
Is there a crista terminalis in the 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 is musculi pectinati?
The pectinate muscles (musculi pectinati) are parallel muscular ridges in the walls of the atria of the heart. Pectinate muscles. Section of the heart showing the ventricular septum.
What is situated at the upper part of crista terminalis?
The sinuatrial node is within the upper part of the crista terminalis. On the external surface of the heart, the crista terminalis occasionally is represented as the sulcus terminalis.
What is crista terminalis of right atrium?
The crista terminalis is a smooth muscular ridge in the superior aspect of the right atrium, formed following resorption of the right valve of the sinus venosus.
Why is the sinus node the pacemaker?
The sinus node continuously generates electrical impulses, thereby setting the normal rhythm and rate in a healthy heart. Hence, the SA node is referred to as the natural pacemaker of the heart.
Why is crista terminalis important?
The differential diagnosis of the crista terminalis is particularly important, especially the mass in the RA, which is mostly detected by echocardiography except for the clinical manifestations of primary diseases. The tumor, thrombus and vegetation are the common cardial mass.
Does left atrium have pectinate muscles?
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.
Why is it called the sinus node?
The sinoatrial node (also known as the sinuatrial node, SA node or sinus node) is a group of cells known as pacemaker cells, located in the wall of the right atrium of the heart….
| Sinoatrial node | |
|---|---|
| System | Electrical conduction system of the heart |
| Artery | Sinoatrial nodal artery |
| Identifiers | |
| Latin | nodus sinuatrialis |
What does the sinus node do?
From the sinus node, electrical signals travel across the atria to the ventricles, causing them to contract and pump blood to the lungs and body. Typically, the sinus node creates a steady pace of electrical impulses. The pace changes depending on activity, emotions and other factors.
What is the anatomy of the pectineal line?
Anatomical terms of bone. [edit on Wikidata] The pectineal line of the pubis (also pecten pubis) is a ridge on the superior ramus of the pubic bone. It forms part of the pelvic brim. Lying across from the pectineal line are fibers of the pectineal ligament, and the proximal origin of the pectineus muscle.
What bone does the pectineus originate from?
The pectineus originates from the pectineal line of the pubic bone, which is also known as the pectin pubis. The pectineus muscle continues downward and in a posterolateral direction (behind and to the side) and inserts into the pectineal line of the femur (thigh bone).
What is the pecten pubis made of?
The pecten pubis forms part of the pelvic brim. Lying across it are fibers of the pectineal ligament and the proximal origin of the pectineus muscle. In combination with the arcuate line, it makes the iliopectineal line.
What fibers make up the iliopectineal line?
Lying across from the pectineal line are fibers of the pectineal ligament, and the proximal origin of the pectineus muscle. In combination with the arcuate line, it makes the iliopectineal line.