Chapter 1 - Anatomy Flashcards
In terms of the “anterior view,” which portion of the heart is dominant?
right ventricle
Name of the left atrioventricular (AV) valve.
Mitral (“bicuspid”) valve (Think “mitraL” = Left AV valve)
In terms of the “electrical view,” which portion of the heart is dominant?
left ventricle (larger mass)
Name of the right atrioventricular (AV) valve.
tricuspid valve
This specialized portion of the heart’s conduction system inervates the entirety of both ventricles, just below the endocardium.
Purkinje fibers
Location of the SA node.
WITHIN the muscle of the right atrium
Average BPM of the SA node
70 BPM
Intrinsic rate of SA node
60 - 100 BPM
Intrinsic rate of atrial myocytes
55-60 BPM
Intrinsic rate of AV node
45-50 BPM
Intrinsic rate of His bundle
40-45 BPM
Intrinsic rate of bundle branches
40-45 BPM
Intrinsic rate of Purkinje fibers
35-40 BPM
Intrinsic rate of ventricular myocytes
30-35 BPM
Location of the AV node
junction of coronary sinus/septal leaflet of the tricuspid
Conduction point between SA node and let atrium.
Bachmann bundle
Right bundle branch terminates in the ______.
purkinje system of the right ventricle
Name the two portions of the terminal region of the left bundle branch.
left anterior fascicle left posterior fascicle
Innervates the antero-superior portion of the left ventricle.
left anterior fascicle
Innervates the posteroinferior region of the left ventricle.
left posterior fascicle* *this is a WIDELY distributed fascicle, so it is very difficult to block
Sketch the cardiac conduction system and intrinsic rates.
