Heart Flashcards

1
Q

layers of heart

A
  • tunica intima: endocardium
  • tunica media: myocardium
  • adventitia: epicardium
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2
Q

endocardium

A
  • lined by endothelium that is continuous with vessels that enter the heart
  • subendothelial layer: collagen, dense fibroelastic CT
  • subendocardial: loose CT connected to myocardium; blood vessels, nerves, & purkinje fibers
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3
Q

myocardium

A

cardiac muscle tissue with deep (circular) & superficial layers (spiral)

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4
Q

epicardium

A
  • outermost layer formed by mesothelial cells

- inner layer of loose CT & adipose tissue, coronary blood vessels

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5
Q

fibrous skeleton

A

skeleton composed of dense irregular CT

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6
Q

septum membranaceum

A

fibrous portion of IV septum

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7
Q

annuli fibrosi

A

fibrous rings around origins of pulmonary arteries, aorta, & atrioventricular canals

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8
Q

trigona fibrosa

A

fibrous tissue between arterial foramina & atrioventricular canals

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9
Q

atrioventricular valves

A

tricuspid &mitral; connected to papillary muscles of ventricles by fibrous cords called chordae tendineae

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10
Q

semilunar valves

A

between ventricles & aorta & pulmonary arteries

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11
Q

what kinds of tissue layers do valves have?

A

dense and loose CT surrounded by endothelium

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12
Q

sinoatrial node

A

pacemaker of heart; contains modified cardiac muscle cells around nodal artery

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13
Q

atrioventricular node

A

lies beneath endocardium in right atrium; forms common stem called bundle of His

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14
Q

atrioventricular bundle of His

A

formed by purkinje fibers; penetrates skeleton & branches to left & right

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15
Q

purkinje fibers

A

modified muscle cells that are filled with glycogen

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