papillary muscle

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papillary muscle

[′pap·ə‚ler·ē ′məs·əl]
(anatomy)
Any of the muscular eminences in the ventricles of the heart from which the chordae tendineae arise.
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Effects of post-rest contraction on myocardial function in papillary muscles from control (white bars; n=11) and obese (black bars; n=11) rats after 33 weeks.
The valve leaflets are adjoined to the anterior or posterior papillary muscles or occasionally, directly to the ventricular wall by CT.
In the direction of illustrating the prospective deficits in cardiac contractile strength, we examined the contractile performance of the isolated RV papillary muscles. The length-dependent activation (Frank-Starling mechanism) is well-maintained in the hearts of these T4-treated mice as we have lately defined [23].
Papillary muscles can be classified into three broad categories depending upon the nature of attachment to ventricular wall and relative length of body of papillary muscle that protrude freely into the ventricular cavity.
Further extension of the process into the inflow tract causes papillary muscle adhesion to the LV wall leading to subsequent mitral regurgitation.
As we can see from Figure 2 in the II group of rats PES potentiation of contraction of papillary muscles was not observed no matter what the duration of ES interval was.
For example, we see very well the endocardial surface of the left ventricular cavity, even in the papillary muscle region despite the fact that it is quite convoluted.
Annulopapillary distance is measured from tip of anterolateral papillary muscles to the annulus at left fibrous trigone (10 o'clock position) and to the point between anterior and middle scallops of mural leaflets (8 o'clock position) and similarly the tip of posteromedial papillary muscles to the annulus, at right fibrous trigone (2 o'clock position) and to the point between the middle and posterior scallops of mural leaflets (4 o'clock position) (Figure 2).
Main findings on ECHO include enlarged right coronary artery, absence of visualization of origin of the left coronary artery from the aorta, increase in the echogenicity of papillary muscles and observation of origin of the left coronary artery from the pulmonary artery.
In addition no appropriate chordae between the A2 segment and the papillary muscles were found.
Presentations include thickening of the septum with or without obstruction, abnormal papillary muscles, large mitral valve leaflets and various combinations of these.
For example, factors resulting in transvalvular gradients under- and over-estimating aortic valve areas are interchanged, the text and diagrams incorrectly assert that one should only trace the early filling wave to determine mean transmitral gradients; restricted mitral valve leaflet motion associated with ischaemia is solely ascribed to ischaemic papillary muscles with no mention of the significance of changes in ventricular geometry.

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