Venule
A larger venule is compared with its accompanying arteriole. The venule displays an irregular outline and its wall consists of an endothelium and subendothelial connective tissue. The wall of the venule is much thinner than that of the arteriole it accompanies. The arteriole has a circular outline, a visible internal elastic lamina, and a prominent tunica media consisting of 2-3 layers of smooth muscle. 400x
Venule
A larger venule is compared with its accompanying arteriole. The venule displays an irregular outline and its wall consists of an endothelium and subendothelial connective tissue. The wall of the venule is much thinner than that of the arteriole it accompanies. The arteriole has a circular outline, a visible internal elastic lamina, and a prominent tunica media consisting of 2-3 layers of smooth muscle. 400x
Arteriole
A larger venule is compared with its accompanying arteriole. The venule displays an irregular outline and its wall consists of an endothelium and subendothelial connective tissue. The wall of the venule is much thinner than that of the arteriole it accompanies. The arteriole has a circular outline, a visible internal elastic lamina, and a prominent tunica media consisting of 2-3 layers of smooth muscle. 400x
Tunica intima
A larger venule is compared with its accompanying arteriole. The venule displays an irregular outline and its wall consists of an endothelium and clearly visible subendothelial connective tissue. The wall of the venule is much thinner than that of the arteriole it accompanies. The arteriole has a circular outline, a visible internal elastic lamina, and a prominent tunica media consisting of 2-3 layers of smooth muscle. 400x
Internal elastic lamina
A larger venule is compared with its accompanying arteriole. The venule displays an irregular outline and its wall consists of an endothelium and clearly visible subendothelial connective tissue. The wall of the venule is much thinner than that of the arteriole it accompanies. The arteriole has a circular outline, a visible internal elastic lamina, and a prominent tunica media consisting of 2-3 layers of smooth muscle. 400x
Tunica media
A larger venule is compared with its accompanying arteriole. The venule displays an irregular outline and its wall consists of an endothelium and clearly visible subendothelial connective tissue. The wall of the venule is much thinner than that of the arteriole it accompanies. The arteriole has a circular outline, a visible internal elastic lamina, and a prominent tunica media consisting of 2-3 layers of smooth muscle. 400x
Tunica adventitia
A larger venule is compared with its accompanying arteriole. The venule displays an irregular outline and its wall consists of an endothelium and clearly visible subendothelial connective tissue. The wall of the venule is much thinner than that of the arteriole it accompanies. The arteriole has a circular outline, a visible internal elastic lamina, and a prominent tunica media consisting of 2-3 layers of smooth muscle. 400x
Image source >
This image was taken of a slide from the University of Mississippi slide collection.