Define Trabeculæ carneæ
Define Trabeculæ carneæ, The trabeculæ carneæ (columnœ carneœ) are rounded or irregular muscle columns that protrude from the entire inner surface of the ventricle except for the conus arteriosus.
What are the types of trabeculæ carneæ
There are three types: some are attached along their entire length on one side and form only distinctive ribs, others are fixed at their ends but free in the middle, while a third group (Musculi capillaries) is connected to the wall by their bases of the ventricle, while their tips lead to the chordæ tend to give, which pass over to be attached to the segments of the tricuspid valve.
There are two papillary muscles,
Anterior and Posterior: of these, the anterior is the larger, and its tendon is connected to the anterior and posterior valve leaflets: the posterior papillary muscle sometimes consists of two or three parts; its chordæ tendineæ are connected to the posterior and medial cusps. In addition, some tendon threads arise directly from the ventricular septum or small papillary ridges on it and go to the anterior and medial cusps. A well-developed muscle ligament in sheep and some other animals often extends from the base of the anterior papillary muscle to the ventricular septum. Because of its attachments, it can help prevent overstretching of the ventricle and has therefore been called the moderator ligament (swept marginal trabecula).
What are the Function of trabeculæ carneæ?
Trabeculae are located at the interface between the intracardiac flow and the compact myocardium. Their fractal branching pattern helps maintain cardiac output in both healthy and failing hearts by increasing contractility and stroke function. Trabecular morphology is also important for intraventricular conduction, suggesting that these complex structures are involved in both cardiac electrophysiology and mechanical function. Compression of the trabecular fiber forms the moderator ligament that carries the right branch of His bundle.
Trabecular spurs also have a function similar to those of the papillary muscles, in that their contraction pulls on the notochord tendinae, preventing the mitral (bicuspid) and tricuspid valves from reversing toward the atrial chambers, resulting in subsequent leakage of blood into the atrial chambers. . This action on the atrial atrioventricular valve prevents blood from flowing back into the atria from the ventricles.
Define Trabeculæ carneæ, Types, function, n20