Email Address
Password
Remember me on this computer
Register New Account
Forgot your password?
Email Address
Please fill the email address you used for registration. An email with password reminder will be sent to you.
Back to sign in screen
Don't have an account?
An email has been sent to you with your password. please check your email inbox.
Back to sign in screen
Don't have an account?
Module title = Tutorial: Bundle Branch Blocks
Lesson title = Anatomy
This is lesson 1 of 8 in this module
The bundle branches arise from the AV node and Bundle of His. The bundle branches are comprised of Purkinje cells, which are specialized cells that
conduct very fast
compared to conduction speed of contracting myocytes. There are a few key points:
the right bundle
rapidly
conducts the depolarizing electrical charge to the RV
the left bundle
rapidly
conducts the depolarizing electrical charge to the LV
the left bundle also conduts the depolarizing electrical charge to the ventricular septum
the conducting fibers are all located on the
endocardial
(inner) surface of the heart. This is extremely important to understand because:
the wave of depolarization travels from endocardium (inner surface) to epicardium (outer surface) as a result of the anatomic location of the conducting fibers
this pattern of depolarization is efficient because it would not be efficient to contract outer layer cells first if the cells on the inner layer were still relaxed
understanding that the wave of depolarization travels
from endocardium to epicardium
is important in understanding other concepts such as Q waves, R wave progression, ST changes and other important concepts that we will cover in future modules.
Ensure that you understand this concept.
The diagram below shows a simple representation of the conducting fibers of the heart:
Lesson 1 of 8
That was the last lesson!
