What is crista terminalis and sulcus terminalis?
What is crista terminalis and sulcus terminalis?
The crista terminalis is generally a smooth-surfaced, thick portion of heart muscle in a crescent shape at the opening into the right atrial appendage. On the external aspect of the right atrium, corresponding to the crista terminalis is a groove, the terminal sulcus.
How is crista terminalis formed?
The crista terminalis (CT) is a well-defined fibromuscular ridge formed by the junction of the sinus venosus and primitive right atrium that extends along the posterolateral aspect of the right atrial wall [1].
What are the pectinate muscles and the crista terminalis?
Structure. Behind the crest (crista terminalis) of the right atrium the internal surface is smooth. Pectinate muscles make up the part of the wall in front of this, the right atrial appendage. In the left atrium, the pectinate muscles are confined to the inner surface of its atrial appendage.
What is the role of sulcus terminalis?
The terminal sulcus marks the separation of the right atrial pectinate muscles from the sinus venarum. The terminal sulcus extends from the front of the superior vena cava to the front of the inferior vena cava, and represents the line of union of the sinus venosus of the embryo with the primitive atrium.
What is the function of sulcus terminalis?
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.
Does the right auricle have pectinate muscles?
Atrium proper – located anterior to the crista terminalis, and includes the right auricle. It is derived from the primitive atrium, and has rough, muscular walls formed by pectinate muscles.
What is the median sulcus of the tongue?
The median sulcus of the tongue separates the body into left and right halves. The terminal sulcus, or groove, is a V-shaped furrow that separates the body from the base of the tongue. At the tip of this sulcus is the foramen cecum, a remnant of the proximal thyroglossal duct.
Where is the terminal sulcus of the crista terminalis?
On the external aspect of the right atrium, corresponding to the crista terminalis is a groove, the terminal sulcus or commonly known as sulcus terminalis. The crista terminalis provides the origin for the pectinate muscles .
What kind of tissue is the crista terminalis?
The crista terminalis is the demarcation of the embryologic sinus venosus and the muscular right atrium. It is a ridge of fibromuscular tissue within the posterolateral right atrial wall.3 When prominent, it can be perceived as a mass by imaging ( Fig. 5.4 ). However, knowledge of normal anatomic variants prevents misdiagnosis.
Can a crista terminalis cause atrial flutter?
The crista terminalis can initiate ectopic atrial beats, especially right atrial tachyarrhythmia, which lead to paroxysmal atrial fibrillation or atrial flutter [ 16 ]. Sanchez-Quintana et al. [ 17] found that two-thirds of focal right atrial tachycardia, in the absence of structure heart disease, arise from the crista terminalis.
Is the crista terminalis visible on fluoroscopy?
The crista terminalis is not visible on fluoroscopy and has a varied course among patients. Therefore, some operators prefer using ICE to help identify the crista, position the tip of the ablation catheter with firm contact on the crista, and assess the RF lesion (see Fig. 11-23). 19,20
What is crista terminalis and sulcus terminalis? The crista terminalis is generally a smooth-surfaced, thick portion of heart muscle in a crescent shape at the opening into the right atrial appendage. On the external aspect of the right atrium, corresponding to the crista terminalis is a groove, the terminal sulcus. How is crista terminalis formed?…