Histology Of Vessels And Lymphatics - Gerdes

Question 1

Arteries and veins have 3 layers which are:

Answer 1

Tunica intima
Tunica media
Tunica adventitia

Question 2

Tunica intima

Answer 2

Innermost layer of endothelium, basal lamina, and subendothelial layer

Question 3

Internal elastic membrane of the tunica intima

Answer 3

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

Question 4

Tunica media

Answer 4

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

Question 5

External elastic membrane

Answer 5

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

Question 6

Tunica Adventitia

Answer 6

Outermost connective tissue later

Contains vasa vasorum (which supplies blood to vessel walls)

Question 7

Vasa vasorum

Answer 7

Supplies blood to vessel walls

Question 8

Basic differences between arteries and veins

Answer 8

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

Question 9

Arteries diameters

Answer 9

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

Question 10

Veins Diameters

Answer 10

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