Histology Of Vessels And Lymphatics - Gerdes Flashcards

1
Q

Arteries and veins have 3 layers which are:

A

Tunica intima
Tunica media
Tunica adventitia

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2
Q

Tunica intima

A

Innermost layer of endothelium, basal lamina, and subendothelial layer

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3
Q

Internal elastic membrane of the tunica intima

A

In the subendothelial layer of the intima. Sheet like layer (lamella) of fenestrated elastic material (internal elastic membrane) that lets substances diffuse And reach cells deep in the vessel wall

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4
Q

Tunica media

A

Middle layer made of circumferentially arranged layers of smooth muscle cells.

This later is pretty thick and extends from the internal to the external elastic membrane

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5
Q

External elastic membrane

A

Layer of elastin that separates the tunica media from the tunica adventitia

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6
Q

Tunica Adventitia

A

Outermost connective tissue later

Contains vasa vasorum (which supplies blood to vessel walls)

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7
Q

Vasa vasorum

A

Supplies blood to vessel walls

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8
Q

Basic differences between arteries and veins

A
  1. Arteries have thicker walls and have relatively thicker TM (tunica media)
  2. Veins have thinner walls, larger and more collapsed lumen, and TA is relatively more prominent
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9
Q

Arteries diameters

A

Large artery (elastic artery): > 1 cm dia
Medium artery (muscular artery): 2-10 mm
Small artery: 0.1 – 2 mm
Arteriole: 10-100 μm (histo text, but physiologists say 5-30 μm), smooth muscle layer 1 -2 cells
Capillary: 4-10 μm, only endothelium

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10
Q

Veins Diameters

A

Postcapillary venule: 10-50 μm, only endothelium and pericytes
Muscular venule: 50-100 μm, smooth muscle layer 1 - 2 cells
Small vein: 0.1 – 1 mm
Medium vein: 1–10mm
Large vein > 1cm

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