Station 2 Flashcards
Names of muscular ridges in RA
Pectinate Muscles
What separates the muscular and smooth intercaval part of RA?
The Crista Terminalis (interiorly) and Sulcus Terminalis (exteriorly)
What are some differences between LA and RA?
Most of LA is smooth - the pectinate muscles of LA are confined to the inner surface of the left auricle.
LA: the entrance of the L and R, superior and inferior pulmonary veins
RA muscular and smooth intercaval surface is separated by crista terminalis.
RA will have entrances of the IVC and SVC, and the coronary sinus
What are the cusps of TV?
Septal, Anterior and Posterior
Cusps of MV?
Anterior and Posterior
Cusps of PV?
Anterior, Left and Right
Cusps of AV?
Posterior, Left and Right
What are the muscular ridges in the ventricles called?
Trabeculae Carneae
What is the septomarginal trabecula?
Trabaculae muscle extending from inferior portion of the IV septum, to the base of the Anterior papillary muscle of the R ventricle.
Contains the R bundle branch of the AV bundle
What are chordae tendinae?
Chordae tendiniae are tendinous cords that connect the papillary muscles to the leaflets of valves
What is the supraventricular crest?
Separates the inflow and outflow tracts in RV
What is the conus arteriosus?
AKA Infundibulum. Is the outflow tract, terminates at base of the pulmonary trunk
What are some differences between LV and RV?
RV has 3 papillary muscles: anterior, posterior and septal
RV contains the moderator band (septoarginal trabecula) that contains the right bundlebranch of the AV bundle
LV has 2 papillary muscles: anterior and posterior
LV wall tends to be thicker ( ) than RV wall ( )
The chordae tendineae of the LV are finer and more numerous than those of the RV
No supraventricular crest, or conus arteriosus (infundibulum) in LV
What is the significance of the papillary muscles in terms of the conduction system of the heart?
The papillary muscles are stimulated first, so that they tense and tightly close the MV/TV to prevent regurgitation during ventricular systole
What are the thicknesses of the RV and LV, normally?
RV free wall= 0.3-0.5cm
LV = free wall 1.3-1.5 normally
