Histo 3: Heart

Question 1

3 Layers of the Heart

Answer 1

1. Endocardium
2. Myocardium
3. Epicardium

Question 2

Easiest place to see endocardium - atrium or ventricle?

Answer 2

atrium (much thicker)

Question 3

Subendocardium

Answer 3

part of the endocardium where yo uwill find vessels and nerves

Question 4

type of connective tissue in endothelium

Answer 4

dense CT

Question 5

Is this atrium or ventricle?

Answer 5

atrium

Question 6

Where will you find Purkinje fibers?

Answer 6

ventricle endothelium

Question 7

Number and placement of nuclei in myocardial cells?

Answer 7

1-2 nuclei, center of cell

Question 8

What unique feature will you see in a longitudinal section of cardiac muscle?

Answer 8

intercalated discs

Question 9

How much more muscle mass does the left ventricle have compared to the right ventricle?

Answer 9

three times the amount

Question 10

What is outlined in orange?

Answer 10

Interventricular septum

Question 11

Does the cardiac skeleton vary amonng species?

Answer 11

yes - could be bone, cartilage, or CT

Question 12

os cordis

Answer 12

when the trigone of the cardiac skeleton becomes ossified (ex: cattle)

Question 13

What kinds of things will you see in the epicardium histologically?

Answer 13

adipose tissue, larger vessels and nerves, layer of mesothelium

Question 14

5 layers of the heart

Answer 14

1. Epicardium
2. Pericardial space
3. Parietal serous pericardium
4. Fibrous pericardium
5. Mediastinal pericardial pleura

Question 15

2 Types of Heart Valves

Answer 15

1. AV (2-3 leaves/cusps)
2. Semilunar (3 cusps)

Question 16

Composition of Heart Valves

Answer 16

endocardium (endothelial cells and CT/fibroblasts)

Question 17

Composition of Chordae Tendinae

Answer 17

80% collagen, 20% elastin/endothelium

Question 18

Trichrome stain

Answer 18

blue stain for collagen in connective tissue