crista terminalis
{{Short description|Anatomical feature of the heart}}
{{Infobox anatomy
| Name = Crista terminalis
| Latin = crista terminalis atrii dextri
| Image = Gray493.png
| Caption = Interior of the heart, frontal view (crista terminalis labeled on the left, second from the top)
| Image2 =Crista terminalis.png
| Caption2 =
| System =
}}
The crista terminalis (also known as the terminal crest,{{Citation needed|date=January 2023}} or crista terminalis of His{{Cite book |last=Gray |first=Henry |url=https://archive.org/details/anatomyofhumanbo1918gray/page/509/mode/2up?view=theater |title=Gray's Anatomy |year=1918 |edition=20th |pages=509}}) is a vertical ridge on the{{Cite book |last=Morton |first=David A. |url=https://www.worldcat.org/oclc/1044772257 |title=The Big Picture: Gross Anatomy |date=2019 |others=K. Bo Foreman, Kurt H. Albertine |isbn=978-1-259-86264-9 |edition=2nd |location=New York |oclc=1044772257}}{{Rp|page=56}} posterolateral{{Citation |last1=Pieper |first1=Matthew S. |title=Chapter 5 - Cardiac Tumors: Imaging |date=2016-01-01 |url=http://www.sciencedirect.com/science/article/pii/B9780323442275000053 |work=Clinical Cardio-Oncology |pages=77–90 |editor-last=Herrmann |editor-first=Joerg |publisher=Elsevier |language=en |doi=10.1016/b978-0-323-44227-5.00005-3 |isbn=978-0-323-44227-5 |access-date=2020-11-17 |last2=Araoz |first2=Philip A.}} inner surface of the adult right atrium extending between the superior vena cava, and the inferior vena cava.{{Rp|page=56}} The crista terminalis denotes where the junction of the embryologic sinus venosus and the right atrium occurred during embryonic development. It forms a boundary between the rough{{Rp|page=56}} trabecular{{Cite book |last=T. W. |first=Sadler |url=https://www.worldcat.org/oclc/1042400100 |title=Langman's Medical Embryology |year=2018 |isbn=978-1-4963-8390-7 |edition=14th |location=Philadelphia |pages=188 |oclc=1042400100}} 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.{{Rp|page=56}}
Anatomy
= Features =
On the external aspect of the right atrium, corresponding to the crista terminalis, is a groove - the terminal sulcus.{{Citation needed|date=January 2023}}
The crista terminalis provides the origin for the pectinate muscles.{{Citation needed|date=January 2023}}
The sinoatrial node is located in the superior part of the crista terminalis at the junction of the right atrium, and superior vena cava.{{Rp|page=60}}
= Development =
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. The right sinus horn 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.{{Rp|page=56}}
Clinical significance
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.
See also
References
{{Reflist}}
External links
- {{SUNYAnatomyLabs|20|13|01|06}} - "Heart: Chamber of Right Atrium"
- {{UMichAtlas|ht_rt_atrium}} - "Right atrium, internal structure, anterior view"
- [https://web.archive.org/web/20070927095135/http://www.ctsnet.org/graphic/cristaterminalis.jpg Diagram at ctsnet.org]
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