Histo Flashcards
What is the function of the cardiac skeleton?
Attachment site for myocardium and valves - also electrical insulation between chambers
What layer of the heart wall is a mesothelium that overlies dense irregular CT and adipose tissue (the visceral layer of the serous pericardium)
The epicardium
What layer of the heart consist of subendothelial dense irregular CT w/ some smooth muscle cells?
The endocardium
ID
ID
What layer of an arterial vessel contains smooth muscle?
Tunica media - elastic and collagen fibers are produced by SM cells and interspersed
What are vasa vasorum?
“vessels of the vessels”
What joins vascular endothelial cells?
Tight junctions - zonula occludens
Possess Weibel-Palade bodies (contain vWF factor and P-selectin)
Elastic arteries
i.e. the aorta and pulmonary arteries
aka conducting arteries
Muscular arteries
aka distributing arteries
Downstream of elastic arteries (i.e. hepatic, renal, and mesenteric arteries)
Resistance arteries
aka arterioles - located w/i organs or tissues
What is shown in the red bracket?
The intimal cushion of the aorta’s tunic intima
What is typically the thickest layer in veins?
The tunica adventitia
Where smooth muscle is located in veins
What type of capillaries are found in the viscera and endocrine organs?
Fenestrate capillaries w/ diaphragms
Where are fenestrated capillaries w/o diaphragms found?
Only in the renal glomerulus
Most permeable type of capillary and location?
Sinusoidal capillaries can be found in the liver, spleen, and marrow
What capillaries are associated w/ pericytes?
Continuous capillaries and postcapillary venules
5/6 - tunica media and lumen of artery
7/8 - tunica adventitia and lumen of vein
Elastin
Muscular artery
Internal elastic lamina is characteristic of muscular/elastic arteries
Purkinje fibers
Venule
Neutrolphils are not normally in capillary/venule
Dysfunction of what tissue is likely to play a key role in the early development of atherosclerosis?
Vascular endothelium
A. Avascular dense irregular CT
C. A nerve fiber
Smooth muscle cells
Secretes collagen and elastic fibers
C. Muscular artery
A. Arteriole
Presence of internal elastic lamina and smooth muscle layers
E. Small vein
E. Smooth muscle
In the largest veins - bundles of smooth muscle run paralell to the lumen within the tunic adventitia
A. Continuous endothelial cells w/ a continuous basal lamina
Continuous endothelial w/ continuous basal lamina - BBB, CT, muscle, and lungs
E. Superficial veins
Arrow pointing at tight junction (zonula occludens) of a capillary
Diaphragm of fenestrated capillary
