Test Four Blood Vessels Flashcards
Describe venules
Endothelium, small amt o layers of smooth muscle, adventitia is thickest layer
What are the three types of capillaries
Continuous, fenestrated and sinusoids
Describe sinusoids capillaries
Openings in endothelium and basal lamina, larger in diameter, slow down blood, fenestrae present
Describe epicardium
Serous covering made up of simple squamous epi, thin CT layer, see adipose
Describe arteriole
Endothelium like continuous capillary, no subendothelial CT, no internal or external elastic lamina, small amount of smooth muscle, thin adventitial layer
Where is vasa vasorum found
In big blood vessels in adventitial layer and outer media layer
Describe elastic arteries
Thick tunica intima, internal elastic lamina, thick layer of smooth muscle 40 to 70 layers, no adventitia and no external elastic lamina
Tunica media is made up of
Smooth muscle (many layers) and external elastic lamina (thinner)
The subendothelial in the tunica intima of blood vessels contains
Loose CT for expansion
Describe small veins
Intima contains endothelium and thin subdenothelial CT layer, media contains smooth muscle with reticular and elastic fibers, valves made up of tunica intima, adventitial layer present
Tunica intima consists of
Endothelium, subendothelium and internal elastic lamina
Describe continuous capillaries
Complete endothelium lining, basal lamina, lacks pores
The inner most layer of the vessels is
Tunica intima
What is in the tunica adventitia
Collagen fibers and elastic fibers , and vasa Vasorum
Describe myocardium
Similar to tunica media, thickest part, cardiac muscle
The internal elastic lamina of the tunic intima of blood vessels contains
Thick band of elastic
Function of vasa vasorum
Allows for diffusion of O2 and nutrients since its so big and thick
Describe large veins
Well developed tunica intima, thinner smooth muscle and CT, well developed adventitia, possibility to see cardiac muscle
Describe endocardium
Similar to tunica intima, simple squamous, subendothelial CT,no elastic lamina
What is the middle layer of the blood vessels called
Tunica media
What is the epi of the tunica intima of blood vessels
Simple squamous that rests on basal lamina
Describe muscular artery
Internal and external elastic lamina, endothelium with thick subendothelial CT, up to 40 layers of smooth muscle
What are the three layers of the heart
Endocardium, myocardium and epicardium
Describe fenestrated capillaries
Endothelium has openings, basal lamina is complete, move large molecules through
What is the outer layer of blood vessels
Tunica adventitia
