Cardiovascular System

Smooth muscle and elastic fibers make up the tunica media.  The elastic tunica intima is not easily defined

http://w3.ouhsc.edu/histology/Text%20Sections/Cardiovascular.html

Artery

Tunica intima faces the lumen. Smooth muscle and elastic fibers make up the tunica media. Underneath is the tunica adventitia made of loose connective tissue.

http://w3.ouhsc.edu/histology/Text%20Sections/Cardiovascular.html

http://erl.pathology.iupui.edu/HISTO

http://www.anatomy.dal.ca/Human_Histology/

Consists of a thick tunica media that consists of smooth muscle and elastin. It is surrounded by a narrow tunica adventitia that is made up of collagen. The tunica intima is a thin layer made up of elastin

http://www.anatomy.dal.ca/Human_Histology/

http://w3.ouhsc.edu/histology/Text%20Sections/Cardiovascular.html

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

http://neuromedia.neurobio.ucla.edu/

The artery has a thicker muscle layer with a darker inner layer that consists of elastin.

The 3 layers tunica intima, tunica media, & tunica adventitia are present in the vein but they are much thinner

The tunica media and the tunica adventita are not clearly defined. Each layer contains smooth muscle and collagen.

http://www.lab.anhb.uwa.edu.au/mb140/

Valves in veins prevent blood from "backing up" in the low-pressure vessels.

http://www.lab.anhb.uwa.edu.au/mb140/

Capillaries are small thin walled vessels. The "discs" in the lumen are red blood cells.

http://www.bio.anl.gov/people/drodi/

Capillary in cross section with a red blood cell. The lining of the vessels is only one cell thick.

http://w3.ouhsc.edu/histology/Text%20Sections/Cardiovascular.html

Capillaries are small thin walled vessels. The "discs" in the lumen are blood cells.

http://www.histologia.cm-uj.krakow.pl/Naczynia/naczynia_1.html

Capillaries are small thin walled vessels. The "discs" in the lumen are blood cells.

http://education.vetmed.vt.edu/Curriculum/

http://www.lab.anhb.uwa.edu.au/mb140/

http://www.lab.anhb.uwa.edu.au/mb140

These are larger and do not stain as darkly.  These are the impulse conducting fiber

http://www.cretin-derhamhall.org/Departmental/

http://casweb.cas.ou.edu/pbell/Histology/

Cardiac muscle has a single nucleus and they are connected by intercalated discs that run transverse to the muscle cell. The connective tissue divides the cell fibers.

The dark lines are intercalated discs.

http://web.upstate.edu/feiglind/index13.

Cardiac Muscle

Transverse section the intercalated discs are not visible.

http://w3.ouhsc.edu/histology/Text%20Sections/

Cardiac muscle cells are connected by intercalated discs that run transverse to the cell

http://www.med.unc.edu/wms/firstaid/histology

Capillaries in the heart muscle

Cardiac tissue in both transverse and longitudinal sections

http://www.lab.anhb.uwa.edu.au/mb140/CorePages/

Cardiac muscle cells are connected by intercalated discs that run transverse to the cell

http://www.siumed.edu/~dking2/crr/CR021b.htm

Layers of the cardiac muscle are epicardium (outer) myocardium (middle) & endocardium (inner)

http://w3.ouhsc.edu/histology/Text%20Sections/Cardiovascular.html

Heart in longitudinal section

The left ventricle (LV) is muscle much larger and contains a thicker muscle layer that the right ventricle (RV)

Left atrium (LA), interventricular septum (IVS)

http://cardiogenomics.med.harvard.edu/

Cardiac Muscle

Purkinje fibers that are stained lighter and darker stained cardiac muscle of the myocardium.

http://w3.ouhsc.edu/histology/Text%20Sections/Cardiovascular.html