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Medium (muscular) artery
The tunica intima is composed of an endothelium, a subendothelial connective tissue and a prominent internal elastic lamina. The tunica media, composed mostly of smooth muscle, is the thickest layer and extends up to the multilayered external elastic lamina. The tunica adventitia begins at the external elastic lamina and is composed of irregular dense connective tissue. 400x

Tunica intima
The tunica intima is composed of an endothelium, a subendothelial connective tissue and a prominent internal elastic lamina. The tunica media, composed mostly of smooth muscle, is the thickest layer and extends up to the multilayered external elastic lamina. The tunica adventitia begins at the external elastic lamina and is composed of irregular dense connective tissue. 400x

- Internal elastic lamina
The tunica intima is composed of an endothelium, a subendothelial connective tissue and a prominent internal elastic lamina. The tunica media, composed mostly of smooth muscle, is the thickest layer and extends up to the multilayered external elastic lamina. The tunica adventitia begins at the external elastic lamina and is composed of irregular dense connective tissue. 400x

Tunica media
The tunica intima is composed of an endothelium, a subendothelial connective tissue and a prominent internal elastic lamina. The tunica media, composed mostly of smooth muscle, is the thickest layer and extends up to the multilayered external elastic lamina. The tunica adventitia begins at the external elastic lamina and is composed of irregular dense connective tissue. 400x

External elastic lamina >
In this section, the external elastic lamina appears well delineated from the tunica adventitia.

Tunica adventitia
The tunica intima is composed of an endothelium, a subendothelial connective tissue and a prominent internal elastic lamina. The tunica media, composed mostly of smooth muscle, is the thickest layer and extends up to the multilayered external elastic lamina. The tunica adventitia begins at the external elastic lamina and is composed of irregular dense connective tissue. 400x