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Cardiovascular organ system > Histology > Flashcards

Flashcards in Histology Deck (11):
1

Coverings of the heart (pericardium) from superficial to deep

Fibrous pericardium: dense irregular connective tissue

serous pericardium: parietal layer. mesothelium (sheet of mesothelial cells on a basement membrane)

pericardial cavity: fluid filled

 

visceral layer of serous pericardium: mesothelium

2

fascia adherens

help cells move as one by connecting their actin filaments

3

macula adherens (desmosomes)

help prevent cells from pulling apart by connecting intermediate filaments

4

purkinje fibers

made of specialized modified cardiomyocytes

- larger in size

- need lots of stored energy

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Ventricularis/atrialis = Layer rich in elastin at the inflow surface.  Elastin facilitates rapid recoil to close the valve quickly.  Lined on the outside with endothelium.

Spongiosa = Central core of loose CT with loosely arranged collagen and elastic fibers.  Dampens vibrations from valve closing.

Fibrosa = Dense irregular connective tissue at the outflow surface that is an extension of the fibrous skeleton.  Lined with endothelium on the outside.  Note: cordae tendineae in AV valves are extensions of the fibrosa.

Inflow surface: ventricularis or atrialis. Depending on where the blood is coming from. Lots of eleastic fibers to snap valve back in place. 

7

Internal elastic lamina present in 

small arteries but not arterioles

8

tunica media in arteriole vs small artery

small artery: 4-10 layers of smooth muscle

 

arteriole: 1-3 layers of smooth muscle

 

pre-capillary sphincter= smooth muscle enlargement in the areriole. 

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