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Anatomical feature of the heart From Wikipedia, the free encyclopedia
The crista terminalis (also known as the terminal crest,[citation needed] or crista terminalis of His[1]) is a vertical ridge on the[2]: 56 posterolateral[3] inner surface of the adult right atrium extending between the superior vena cava, and the inferior vena cava.[2]: 56 The crista terminalis denotes where the junction of the embryologic sinus venosus and the right atrium occurred during embryonic development.[3] It forms a boundary between the rough[2]: 56 trabecular[4] portion and the smooth, sinus venosus-derived portion (sinus venarum) of the internal surface of the right atrium. The sinoatrial node is located within the crista terminalis.[2]: 56
Crista terminalis | |
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Details | |
Identifiers | |
Latin | crista terminalis atrii dextri |
TA98 | A12.1.01.003 |
TA2 | 4025 |
FMA | 9236 |
Anatomical terminology |
The crista terminalis generally takes the form of a smooth-surfaced, crescent-shaped thickened portion of heart muscle at the opening into the right atrial appendage.[citation needed] It consists of fibromuscular tissue.[3]
On the external aspect of the right atrium, corresponding to the crista terminalis, is a groove - the terminal sulcus.[citation needed]
The crista terminalis provides the origin for the pectinate muscles.[citation needed]
The sinoatrial node is located in the superior part of the crista terminalis at the junction of the right atrium, and superior vena cava.[2]: 60
During the development of the human heart, the right horn and transverse portion of the sinus venosus ultimately become incorporated with and form a part of the adult right atrium.[1] The right sinus horn[4] of the sinus venosus develops into the sinus venarum; in the adult right atrium, the portion of right atrium derived from the sinus venosus has a smooth inner surface.[2]: 56
A prominent crista terminalis may be mistaken for a cardiac mass during heart imaging; a prominent crista terminalis appears as a hyperechoic ridge on echocardiography, and homogenous to adjacent atrial wall on CT and MRI.[3]
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