Histology Prelab - Cardiovascular System Exam With
complete solution–Expert Verified | Latest Questions 2025
Tunica intima/interna
Tunica media
Tunica adventitia - What are the types of tunica?
Endothelium, BM, LCT - What is in the tunica intima?
All vessels except capillaries - What vessels is the tunica intima present in?
Internal Elastic Lamina
prominent layer of elastin present in muscular arteries located between tunica intima
and tunica media - What is IEL?
IEL, valves, endocardium - What are the variations of the tunica intima?
Extensions of intima protrude into lumen of medium and large veins, lymph vessels, and
heart - What are valves?
Endothelium and CT of the heart (equivalent to tunica intima) - What is the
endocardium?
DRCT covered with endocardium - What are heart valves made up of?
Subendocardium - What layer is the cardiac skeleton found in?
tunica intima, endocardium and core of DRCT - Venous valves are located in
____________ (layer) while cardiac valves are located in ___________
Smooth muscle, elastic fibers, Type I & III collagen - What is in the tunica media?
External elastic lamina, elastic sheets (lamella), myocardium - What are the variations
of the tunica media?
Layer of elastin present between tunica media and adventitia of some larger conducting
and medium distributing arteries - What is external elastic lamina?
Concentric layers of elastin arranged as membranous sheets in large elastic arteries
(aorta) - What are elastic sheets (lamella)?
Muscular layer of heart comprised of cardiac muscle (not smooth muscle) - What is
myocardium?
Smooth muscle - What synthesizes the fibers in the tunica media wall?
, Mutations in Type III collagen - affects heart and blood vessels since reticular fibers are
important - What is Elhers-Danlos syndrome?
Mutations in elastic fiber synthesis - affects large elastic and medium vessels the most -
What is Marfan syndrome
DICT and LCT - What is in the tunica adventitia?
all vessels except capillaries (thickness varies) - What vessels is tunica media present
in?
Large to medium-sized vessels (not well developed in arterioles and venules) - What
vessels is tunica adventitia present in?
Large veins - smooth muscle
Vasa vasorum
Nervi vasorum
Epicardium - What are the variations/notable features of the tunica adventitia?
Small blood vessels found in tunica adventitia of large aa. and vv. - What is vena
vasorum?
nerve fibers supplying vessels found in T. adventitia - provides vasamotor tone to vessel
wall - What is nervi vasorum?
CT, adipose tissue, coronary blood vessels, covered with mesothelium as the most
external layer - What is in epicardium?
longitudinally - In large veins, smooth muscle is arranged ________________ to aid in
venous return
Thick walls, small lumen, generally appear rounded - What is the appearance of
arteries?
Thin walls, large and collapsed lumen, generally appear flattened with RBC in lumen -
What is the appearance of veins?
Endothelium appears wavy due to constriction of smooth muscle
Internal elastic membrane present in large aa. - What does the T intima look like in
arteries?
Thin and hard to distinguish
Endothelium appears smooth
No internal elastic membrane
Valves present in medium vv. - What does the T. intima look like in veins?
complete solution–Expert Verified | Latest Questions 2025
Tunica intima/interna
Tunica media
Tunica adventitia - What are the types of tunica?
Endothelium, BM, LCT - What is in the tunica intima?
All vessels except capillaries - What vessels is the tunica intima present in?
Internal Elastic Lamina
prominent layer of elastin present in muscular arteries located between tunica intima
and tunica media - What is IEL?
IEL, valves, endocardium - What are the variations of the tunica intima?
Extensions of intima protrude into lumen of medium and large veins, lymph vessels, and
heart - What are valves?
Endothelium and CT of the heart (equivalent to tunica intima) - What is the
endocardium?
DRCT covered with endocardium - What are heart valves made up of?
Subendocardium - What layer is the cardiac skeleton found in?
tunica intima, endocardium and core of DRCT - Venous valves are located in
____________ (layer) while cardiac valves are located in ___________
Smooth muscle, elastic fibers, Type I & III collagen - What is in the tunica media?
External elastic lamina, elastic sheets (lamella), myocardium - What are the variations
of the tunica media?
Layer of elastin present between tunica media and adventitia of some larger conducting
and medium distributing arteries - What is external elastic lamina?
Concentric layers of elastin arranged as membranous sheets in large elastic arteries
(aorta) - What are elastic sheets (lamella)?
Muscular layer of heart comprised of cardiac muscle (not smooth muscle) - What is
myocardium?
Smooth muscle - What synthesizes the fibers in the tunica media wall?
, Mutations in Type III collagen - affects heart and blood vessels since reticular fibers are
important - What is Elhers-Danlos syndrome?
Mutations in elastic fiber synthesis - affects large elastic and medium vessels the most -
What is Marfan syndrome
DICT and LCT - What is in the tunica adventitia?
all vessels except capillaries (thickness varies) - What vessels is tunica media present
in?
Large to medium-sized vessels (not well developed in arterioles and venules) - What
vessels is tunica adventitia present in?
Large veins - smooth muscle
Vasa vasorum
Nervi vasorum
Epicardium - What are the variations/notable features of the tunica adventitia?
Small blood vessels found in tunica adventitia of large aa. and vv. - What is vena
vasorum?
nerve fibers supplying vessels found in T. adventitia - provides vasamotor tone to vessel
wall - What is nervi vasorum?
CT, adipose tissue, coronary blood vessels, covered with mesothelium as the most
external layer - What is in epicardium?
longitudinally - In large veins, smooth muscle is arranged ________________ to aid in
venous return
Thick walls, small lumen, generally appear rounded - What is the appearance of
arteries?
Thin walls, large and collapsed lumen, generally appear flattened with RBC in lumen -
What is the appearance of veins?
Endothelium appears wavy due to constriction of smooth muscle
Internal elastic membrane present in large aa. - What does the T intima look like in
arteries?
Thin and hard to distinguish
Endothelium appears smooth
No internal elastic membrane
Valves present in medium vv. - What does the T. intima look like in veins?
