(right and left) fibrous rings of heart

(redirected from Lower ring)

(right and left) fi·brous rings of heart

[TA]
two fibrous rings that surround atrioventricular orifices of the heart, providing attachment for the atrioventricular valve leaflets and maintaining patency of the orifices. As part of the fibrous skeleton of the heart, the fibrous rings also provide origin and insertion for the myocardium.
References in periodicals archive ?
The domed roof has a lower ring of calligraphy and frescoes delicately painted arching upwards.
Flanges on laser-welded differential cases can be smaller, and the higher-quality welds and reduced heat stresses can contribute to lower ring gear deformation, meaning quieter operation.
Georgia Power, the largest subsidiary of Southern Company (NYSE: SO), has expanded Plant Vogtle near Waynesboro, Georgia, with the placement of the lower ring for Unit 4.
The lower ring rides up a set of ramps on the upper ring--pretty neat
At a time when the technology of castle building was racing ahead, the king's other new castles in Wales, like Rhuddlan and Holt, were each marvels of modern engineering where a circle of tall inner walls was perfectly mirrored by a lower ring of outer walls.
Local media reported that almost the entire lower ring of the stands was soaked although Secopa played down the problem, saying the leaks were not serious and would not affect any of the matches being played there during next year's World Cup.
The seats are spread throughout the lower ring and cater for views from all angles of the pitch," the government said.
If the product is a lower ring, then you're going to see probably the same, but if it is a higher ring, you're going to see a definite increase.
Only a small elevation correction may be required if changing to a higher or lower ring set.
The design of the CR Twin involves a lower ring with a single-lip air distributor that provides gradual cooling to stabilise the bubble and increase its physical properties.
At the front of the hole in each AQD base there is a fixed cross pin, which engages the groove in the lower ring half stud.
The old store is dilapidated and a new store would enhance the lower ring road in Huddersfield, along with providing a more modern sports centre, replacing the one that will soon be needing money wasting on it to refurbish it.

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