Histology of Blood Cells, Cardiac Muscle, Blood

Vessels and Lymphatics

Formed Elements of Blood

• Formed Elements = Erythrocytes, Leukocytes, Platelets

• Non-formed Elements = Plasma

erythrocyte

neutrophil eosinophil

basophil

lymphocyte

monocyte

platelets

Three neutrophils and a lymphocyte.

Two eosinophils.

A neutrophil and a monocyte.

A monocyte and a neutrophil.

A monocyte, neutrophil, lymphocyte, and basophil.

A monocyte

A lymphocyte and a neutrophil.

One small lymphocyte, a

larger lymphocyte and an

eosinophil.

An eosinophil and small lymphocyte.

A neutrophil,

and a basophil.

platelets.

Cardiac Muscle = Myocardium

The Structure of Blood Vessels

• Tunica Interna (also called the Tunica Intima)

– smooth inner layer that repels blood cells and platelets

– endothelium of simple squamous cells on a basement

membrane

• Tunica Media

– middle layer of smooth muscle, collagen, elastic fibers

– smooth muscle causes vasoconstriction and

vasodilation

• Tunica Externa (also called the Tunica Adventitia)

– outermost layer of loose connective tissue

– holds vessels in place

http://www.siumed.edu/~dking2/crr/cvguide.htm#vessels

Blood Vessel Layers

Veins and Arteries

http://www.siumed.edu/~dking2/crr/CR025b.htm

http://www.histol.chuvashia.com/atlas-en/circulatory-en.htm

Aorta

1 Tunica Intima

2 Tunica Media

3 Tunica Adventitia

Lymph Vessels and

Lymph Node

http://education.vetmed.vt.edu/Curriculum/VM8304/lab_companion/Histo-Path/VM8054/Labs/Lab13/EXAMPLES/Exlymnod.htm

Lymph Node capsule

Germinal

Centers

lymphocytes

Lymphatic vessel (L) next to a small vein (V). Lymphatics due not contain

RBCs, but often contain a few lymphocytes. Taken from Wheater’s Functional

Histology, a text and colour atlas, p. 156, Figures 8.22 and 8.23.

Lymph Vessel and a Small Vein

A lymph vessel valve (V). Taken from Wheater’s Functional Histology, a

text and colour atlas, p. 156, Figures 8.22 and 8.23.