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Left Fibrous Trigone
Cardiovascular System

Left Fibrous Trigone

Trigonum fibrosum sinistrum

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Morphology/Structure

The right and left fibrous trigones are the strongest portions of the fibrous skeleton and consist of dense connective tissue which sits around the right atrioventricular orifices.

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Key Features/Anatomical Relations

The left fibrous trigone connects the left fibrous ring to the aortic ring.

Function

The left fibrous trigone provides structural support to the left atrioventricular and aortic valves. It also aids in the structural support of the membranous septum and serves as a direct attachment for the myocardium. The collagen of the fibrous ring helps to separate electrical activities between the chambers by insulating the propagation of electrical impulses during a heartbeat.

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Bladder Trigone

ScienceDirect image

The bladder trigone effectively gives the endodermal wall of the vesicourethral canal a mesodermal contribution.

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