cardiovascular system: putting the heart into histo
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Cardiovascular System:
Putting the Heart into
Histo
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Mesothelium
Lecture 9, Slide 1
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3 Layers3 LayersEndocardiumEndocardiumMyocardiumMyocardiumEpicardiumEpicardium
L9, S2
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Fibrous TrigoneFibrous Trigone Forms the base of Forms the base of
tissue from which tissue from which the valves are the valves are anchoredanchored
Separates atria Separates atria from ventriclesfrom ventricles
Atria and ventricle Atria and ventricle only communicate only communicate through the AV through the AV bundlebundleL9, S2
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EpicardiumEpicardium
DFIACTDFIACT AdiposeAdipose Coronary vessels Coronary vessels
and cardiac nervesand cardiac nerves Externally lined by Externally lined by
mesotheliummesothelium Simple squamous Simple squamous
cellscells Secrete serous fluid Secrete serous fluid
at visceral and at visceral and parietal pericardiumparietal pericardium
L9, S3
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Z
I
M
A H
L9, S5
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MyocardiumMyocardium L9, S6L9, S4
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Masson’s Trichrome
EndocardiumEndocardium Inner layerInner layer
Simple squamous Simple squamous epithelium and CTepithelium and CT
Elastic laminaElastic lamina Middle layerMiddle layer
LACT with smooth LACT with smooth musclemuscle
Subendocardial Subendocardial layerlayer Purkinje fibersPurkinje fibers Continuous with Continuous with
myocardiummyocardium
L9, S7
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Purkinje FibersPurkinje Fibers Branches of the Branches of the
AV bundle of HisAV bundle of His Cardiac muscle Cardiac muscle
modified for modified for conducting conducting impulsesimpulses
Located in the Located in the subendotheliumsubendothelium
L9, S11
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Hypertrophied cardiac muscle Hypertrophied cardiac muscle fibersfibers
One or two nuclei centrally situatedOne or two nuclei centrally situated Rich in glycogen and mitochondriaRich in glycogen and mitochondria
L9, S12
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1
2
3
Tunica IntimaTunica Intima Internal Elastic Internal Elastic
Membrane Tunica Membrane Tunica MediaMedia
External Elastic External Elastic MembraneMembrane
Tunica AdventitiaTunica Adventitia
L9, S13
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The Aorta: An Elastic The Aorta: An Elastic ArteryArtery
Tunica IntimaTunica Intima Endothelium and BMEndothelium and BM
Internal Elastic MembraneInternal Elastic Membrane Tunica MediaTunica Media
Reticular or Elastic fibersReticular or Elastic fibers SMCs connecting elastic SMCs connecting elastic
fibersfibers External Elastic External Elastic
MembraneMembrane Tunica AdventitiaTunica Adventitia
DiffuseDiffuse Vasa vasorumVasa vasorum Nervi vascularusNervi vascularus
L9, S16
L9, S15
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A
B
C
D
E
F
G
A = AortaA = Aorta B = VeinB = Vein C = ArteryC = Artery D = NerveD = Nerve E = Brown adiposeE = Brown adipose F = White adiposeF = White adipose G = CTG = CT
L9, S17
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AortaAorta
Weigert Stain of Weigert Stain of the Elastic laminathe Elastic lamina
L9, S19
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A
B
C
D
E. None of the above Q1
L9, S6L9, S4
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A B
Q2 and Q3
L9, S12