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Histology Unit 3 > HE 23/24 Heart Histology > Flashcards

HE 23/24 Heart Histology Flashcards

1
Q

What are purkinje fibers and where are they found?

A

They are modified cardiac muscle fibers that are not contractile but are part of the heart conduction system.
Found in the subendocardial layer which is between the subendothelial layer and the myocardial layer.

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2
Q

What are the three layers of the heart?

A

Endocardium
Myocardium
Epicardium

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3
Q

What happens to the heart during weeks 3-4?

A

Heart and vessels begin to develop
Embryonic circulation established
Heart begins to beat
Cardiac looping complete

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4
Q

What happens to the heart during week 5?

A

Partitioning of the into 4 chambers begins.

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5
Q

What happens to the heart during week 6?

A

Aortic arches undergo primary changes to adult form.

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6
Q

What happens to the heart during week 8?

A

Formation of heart valves is complete.

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7
Q

What is the master gene required for the development of the primary heart field?

A

NKX-2.5

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Histology Unit 3 (6 decks)

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