Flashcards in Histology: Cardiac Histology Deck (10):
What chamber of the heart has the thickest layer?
What chamber of the heart has the thinnest layer?
What is the endocardium and what makes it up?
• Innermost layer
• Composed of:
– Simple squamous epithelium (endothelium)
– Connective Tissue
– Subendocardium: in contact with cardiac muscle and contains small vessels, nerves, and Purkinje Fibers.
What are the Purkinje-Fibers?
• Impulse conducting fibers
• Large modified muscle cells
What is the thickest part of the heart wall?
What are intercalated disks?
– Junctional complexes that contain fascia adherens, desmosomes, and gap junction to provide connection and communication.
– Bind myocytes and allow ion exchange to facilitate electrical impulses to pass
What is the epicardium and what is it composed of?
• Outermost layer of the heart
• Composed of connective tissue with nerves, vessels, adipocytes and an outer layer of mesothelium
• Mesothelium secretes pericardial fluid
• Covers and protects the heart
What are the AV valves?
– 2 AV (mitral and tricuspid) in the chambers
What are the semilunar valves?
– 2 semilunar (aortic /pulmonary)