Histology Guide virtual histology laboratory

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200 Photographs

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Histology Guide

Chapter 9 - Cardiovascular System

The cardiovascular system transports blood to and from tissues. It consists of a pump (heart), vessels to deliver blood to tissues (arteries), network of vessels to perfuse tissues (capillaries) and vessels to return blood to the heart (veins).

Heart

Cardiac muscle is striated, involuntary muscle found in the heart wall.

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MH 069 Heart

(right and left atria)

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MH 070 Heart

(right and left ventricles)

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MH 070 Cardiac Muscle

Heart Valves and Cardiac Skeleton

The cardiac skelton is dense connective tissue that fibrous rings that surround and support the cardiac valves.

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MH 071 Heart

(tricuspid valve and coronary artery)

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MH 073-074 Heart

(aortic valve and cardiac skeleton)

(H&E / phosphotungstic acid)

Purkinje Fibers

Purkinje fibers are specialized muscle fibers that relay impulses to create synchronized contractions of the ventricles.

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MH 073-074 Heart

(H&E / phosphotungstic acid)

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MH 058a Heart

(periodic-acid Schiff's stain)

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MHS 245 Heart

Vessels

Areteries fall into three categories: elastic arteries, muscular arteries and arterioles, each with specific charaacteristics and function.

Elastic Artery and Large Vein

Elastic arteries (arota, carotid, subclavian and lilac arteries) have two functions: conduction of a large volume of lood and maintenance of blood pressure during diastole.

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MH 063 Carotid Artery and Brachiocephalic Vein

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MHS 244 Elastic Artery

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MH 065-066 Aorta and Vena Cava

(H&E / Verhoeff)

Muscular Artery and Medium Vien

Muscular arteries cover a wide range of sizes and regulate the distribution of blood various regions of the body.

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MH 024-025-026 Mesentery

(H&E / Verhoeff / azan)

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MH 061-062 Popliteal Artery and Vein

(H&E / Verhoeff)

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MH 067 Vein Valve

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MH 071 Heart

(coronary artery)

Arterioles and Venules

Arterioles are the smallest category of arteries which have a role in maintaining blood pressure.

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MH 024-025 Mesentery

(H&E / Verhoeff)

Microvasculature

Capillaries are the smallest blood vessels in the body. They are responsible for the exchange of gases, nutrients and other substances between blood and tissues.

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MH 024 Mesentery

(capillaries)

Sinusoidal capillaries are larger than other capillaries and have a discontinuous endothelium. This allows easier movement of cells between the blood and tissues.

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MH 155a Adrenal

(sinusoidal capillaries)

Capillary beds can be seen in whole mounts of tissues.

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MH 060 Microvasculature (mesentery)

(silver)