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Flashcards in Histology Deck (11):

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


fascia adherens

help cells move as one by connecting their actin filaments


macula adherens (desmosomes)

help prevent cells from pulling apart by connecting intermediate filaments


purkinje fibers

made of specialized modified cardiomyocytes

- larger in size

- need lots of stored energy



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. 


Internal elastic lamina present in 

small arteries but not arterioles


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.