SINUS TERMINALIS Meaning and
Definition
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Sinus terminalis refers to a specific anatomical feature found in the human heart. It is a crescent-shaped depression located on the internal surface of the right atrium, particularly in the atrial wall where it meets the superior vena cava.
The term "sinus" in anatomical contexts typically refers to a recess or cavity. In this case, sinus terminalis can be understood as the terminal point or end of the smooth portion of the right atrium. It is characterized by a distinct ridge called the crista terminalis and is demarcated from the rough or trabeculated part of the right atrium, which contains muscular ridges known as trabeculae carneae.
The sinus terminalis plays an important role in the electrical conduction system of the heart. Specifically, it serves as a landmark for the sinoatrial (SA) node, which is often referred to as the natural pacemaker of the heart. The SA node is responsible for initiating the electrical impulse that regulates the heart's rhythm. Its close association with the sinus terminalis allows for coordination between the atrial and ventricular contractions during the cardiac cycle.
Understanding the anatomy and function of the sinus terminalis is crucial in diagnosing and treating various cardiovascular conditions, as certain abnormalities or irregularities in this region can contribute to heart rhythm disturbances such as atrial fibrillation.
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The vein bounding the area vasculosa in the blastoderm.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
Common Misspellings for SINUS TERMINALIS
- ainus terminalis
- zinus terminalis
- xinus terminalis
- dinus terminalis
- einus terminalis
- winus terminalis
- sunus terminalis
- sjnus terminalis
- sknus terminalis
- sonus terminalis
- s9nus terminalis
- s8nus terminalis
- sibus terminalis
- simus terminalis
- sijus terminalis
- sihus terminalis
- sinys terminalis
- sinhs terminalis
- sinjs terminalis
- sinis terminalis
Etymology of SINUS TERMINALIS
The term "sinus terminalis" comes from Latin.
The word "sinus" in Latin means "curve" or "bend" and is commonly used to refer to a rounded projection or concave shape. It can also more specifically refer to a cavity or hollow, such as a sinus in the body.
The word "terminalis" comes from the Latin word "terminus", which means "boundary" or "end". It is often used to imply something that is situated at the end or terminal point of something.
Therefore, "sinus terminalis" can be translated to mean "terminal or end curve" or "boundary cavity". This term is often used in anatomy and refers to the boundary or junction between the thick and thin walls of the right atrium of the heart.
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