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24 Cards in this Set

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Tunica intima
Inside Layer of blood and lymphatic vessels

- Endothelium - Single layer of flattened squamous

- Subendothelium- zone of loose C.T, contains collagen and elastic fibers

- Internal Elastic Membrane- Avascular, corrugated to allow tisue fluid to reach outer layers
Tunica Media
Middle Layer of Blood and lymphatic vessels

- Smooth muscle fibers- responsible for vasoconstriction

- Collagen and elastic fibers- run inbetween muscle fibers

- External elastic membrane- elastic fibers thart seperate tunica media from adventitia, avascular
Tunica adventitia
Outer layer of Blood and lymphatic vessels

-Collagen fibers- bundles in excess

- Elastic Fibers- usually concentrate at inner part

-Vasa Vasora- vessels supplying vessels present in adventitia of thick walled vessels
Large
Elastic arteries. Lumen is wide in comparison of thickness of wall

-Tunica Intima- Subendo is wide zone.

-Tunica Media- thickest layer, comprises 75-80% of thickness. Made up of multiple corrugated elastic membranes

-Tunica Adventita- Vaso Vasora supply the wall.
Arterioles
Lumen small and wall appears appear think compared to Lumen

-Tunica Intima

-Tunica Media- thickest zone, lack external elastic membranes

-Tunica Aventitia
Venules
Larger in Diameter than companion arterioles

- Tunica intima
- tunica Media
-Tunica Adventita
medium/small Arteries
- Tunica intima
- Tunica Media
- Tunica Adventita
Small and Medium sized veins
- Tunica intima- no internal elastic membrane

- Tunica Media- no external elastic membrane

- Tunica Adventita- widest zone, MAY contain vasa vasora (??? thats highlighted... wtf?")
Venous Valves
Pocket type valves and are made up of folds of tunica intima
Capillaries
Type I- continuous endothelium- most common

Type II- fenestrated endothelium- fenestrated (showing holes). This type occurs where there is absorption of filtration of fluid (i.e. intestines and glomeruli of kidney)
Sinusoids
Capillary sinusoids
Regular sinusoids
Connections between arterial and venous sides
1- Capillaries
2- Sinusoids
3- Arterio-venous anastomosis
Capillaries
represent the main connection between arterial and venous sides of circulation. Very small vessels with a diameter of 7-9 microns
Pericytes
Are flattened branching cells in relation to outer walls of blood capillaries. These cells may differentiate into phagocytotic or contractile cells
True sinusoids
larger than capillaries. Their diameter ranges between 40-50 microns.

Blood sinusoids found in the liver, spleen and bone marrow
Sinusoidal Capillaries
Are present more commonly in some endocrine glands like pituitary or adrenal
Arteriovenous Anastomoses or Shunts
Connect arterioles with venules directly, bypassing capillaries.

-Tunica Intima
-Tunica Media- Very thick
-Tunica Adventitia

Locations: Tips of fingers, toes, nose, lips, ears, and some internal organs.
glomus
Arteriovenous anastomoses of the fingers and toes made up of branching convuluted vessels
Endocardium
Innermost layer of heart

A. inner zone: a thin sheet of fine collagen fibers

B. Middle zone: Collagen fibers, elastic fibers, and smooth muscle fibers

C. Outer zone- frequently called the subendothelium. Made up of loose areoler. Also contains Purkinje Fibers
Myocardium
Middle and thickest layer of the heart.

Myocardium sends projections into the lumen to form the papillary muscles
Epicardium
Outer layer of the heart

A Serous Layer- covers heart and represents visceral layer of pericardium. Made of mesothelial cells

B. Subepicardial layer- internal to serous membrane connecting it to the myocardium
Valves of the Heart
Tricuspid and Mitral.
Semilunar Valves
found at root of aorta and pulmonary artery
Conducting system of heart
SA and AV nodes

Purkinje Fibers (Bundle of His)- found in the subendocardium