Right ventricle internal structure
Terms
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- Gen Rt Ventricle
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forms the largest part of anterior heart surface, small part of diaphragmatic surface and almost entire inferior border of heart
-deoxy blood from rt atrium comes in and is pumped to lungs - trabeculae carnae
- irregular muscular elevations on the interior of r. ventricle
- papillary muscles
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-form conical projections with base on vent wall and tendinous cords arising from apices
-cords attached to adjacent sides of 2 cusps-prevent inversion and seperation of cusps (parachute)
-begin contraction before systol closing tricuspid valve
3types- ant, post, septal - Papillary muscle types
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Anterior-largest, arise on ant wall, cords to ant and post cusps
Posterior-smaller and made up of several parts, from inferior wall, cords to post and septal cusps
Septal- from interverntricular septum, cords to ant and septal cusps - septomarginal trabecular (moderator band)
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curved muscle bundle from inf part of interventricular septum to base of ant papillary
-carries part of the right bundle branch of the AV bundle(part of conductiong system to ant papillary - Supraventricular crest
- - thick muscular ridge which separates the ridged muscular wall of inflow part of chamber from the smooth wall of the conus arteriosus
- conus arteriosus
- arterial cone which leads into pulmonary trunk (on the superior part of r. ventricle)
- pulmonary valve
- Left, right and anterior semilunar cusps- concave when viewed superiorly; these project into artery but lie close to its walls as blood leave the r. ventricle; cusps uopen up like pockets as they catch reversed blood flow and completely close pulmonary opening to prevent significant amount of blood from returning to r. ventricle
- Nodule
- the center of each cusp (where it comes into contact with other cusps)
- Lunule
- the adjacent free edge of the cusp
- sinus
- superior to each valve—spaces at the origin of the pulmonary trunk between the dilated wall of the vessel and each cusp of the pulmonary valve