Histology Flashcards Preview

Cardiovascular organ system > Histology > Flashcards

Flashcards in Histology Deck (11)
Loading flashcards...
1
Q

Coverings of the heart (pericardium) from superficial to deep

A

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
Q

fascia adherens

A

help cells move as one by connecting their actin filaments

3
Q

macula adherens (desmosomes)

A

help prevent cells from pulling apart by connecting intermediate filaments

4
Q

purkinje fibers

A

made of specialized modified cardiomyocytes

  • larger in size
  • need lots of stored energy
5
Q
A
6
Q
A

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
Q

Internal elastic lamina present in

A

small arteries but not arterioles

8
Q

tunica media in arteriole vs small artery

A

small artery: 4-10 layers of smooth muscle

arteriole: 1-3 layers of smooth muscle

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

9
Q
A
10
Q
A
11
Q
A