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Large vein

At higher magnification, the components of the three tunics are evident.  In the tunica intima, smooth muscle fibers are present in the connective tissue beneath the endothelium; the elastin stain clearly shows the internal elastic lamina.  Large collagen bundles and circularly arranged smooth muscle comprise the tunica media.  The tunica adventitia contains longitudinally oriented smooth muscle fibers and collagen.  400x

Tunica intima <p>At higher magnification, the components of the three tunics are evident.  In the tunica intima, smooth muscle fibers are present in the connective tissue beneath the endothelium; the elastin stain clearly shows the internal elastic lamina.  Large collagen bundles and circularly arranged smooth muscle comprise the tunica media.  The tunica adventitia contains longitudinally oriented smooth muscle fibers and collagen.  400x</p>

Tunica intima

At higher magnification, the components of the three tunics are evident.  In the tunica intima, smooth muscle fibers are present in the connective tissue beneath the endothelium; the elastin stain clearly shows the internal elastic lamina.  Large collagen bundles and circularly arranged smooth muscle comprise the tunica media.  The tunica adventitia contains longitudinally oriented smooth muscle fibers and collagen.  400x

 - Endothelium <p>At higher magnification, the components of the three tunics are evident.  In the tunica intima, smooth muscle fibers are present in the connective tissue beneath the endothelium; the elastin stain clearly shows the internal elastic lamina.  Large collagen bundles and circularly arranged smooth muscle comprise the tunica media.  The tunica adventitia contains longitudinally oriented smooth muscle fibers and collagen.  400x</p>

- Endothelium

At higher magnification, the components of the three tunics are evident.  In the tunica intima, smooth muscle fibers are present in the connective tissue beneath the endothelium; the elastin stain clearly shows the internal elastic lamina.  Large collagen bundles and circularly arranged smooth muscle comprise the tunica media.  The tunica adventitia contains longitudinally oriented smooth muscle fibers and collagen.  400x

 - Internal elastic lamina <p>At higher magnification, the components of the three tunics are evident.  In the tunica intima, smooth muscle fibers are present in the connective tissue beneath the endothelium; the elastin stain clearly shows the internal elastic lamina.  Large collagen bundles and circularly arranged smooth muscle comprise the tunica media.  The tunica adventitia contains longitudinally oriented smooth muscle fibers and collagen.  400x</p>

- Internal elastic lamina

At higher magnification, the components of the three tunics are evident.  In the tunica intima, smooth muscle fibers are present in the connective tissue beneath the endothelium; the elastin stain clearly shows the internal elastic lamina.  Large collagen bundles and circularly arranged smooth muscle comprise the tunica media.  The tunica adventitia contains longitudinally oriented smooth muscle fibers and collagen.  400x

Tunica media <p>At higher magnification, the components of the three tunics are evident.  In the tunica intima, smooth muscle fibers are present in the connective tissue beneath the endothelium; the elastin stain clearly shows the internal elastic lamina.  Large collagen bundles and circularly arranged smooth muscle comprise the tunica media.  The tunica adventitia contains longitudinally oriented smooth muscle fibers and collagen.  400x</p>

Tunica media

At higher magnification, the components of the three tunics are evident.  In the tunica intima, smooth muscle fibers are present in the connective tissue beneath the endothelium; the elastin stain clearly shows the internal elastic lamina.  Large collagen bundles and circularly arranged smooth muscle comprise the tunica media.  The tunica adventitia contains longitudinally oriented smooth muscle fibers and collagen.  400x

Tunica adventitia <p>At higher magnification, the components of the three tunics are evident.  In the tunica intima, smooth muscle fibers are present in the connective tissue beneath the endothelium; the elastin stain clearly shows the internal elastic lamina.  Large collagen bundles and circularly arranged smooth muscle comprise the tunica media.  The tunica adventitia contains longitudinally oriented smooth muscle fibers and collagen.  400x</p>

Tunica adventitia

At higher magnification, the components of the three tunics are evident.  In the tunica intima, smooth muscle fibers are present in the connective tissue beneath the endothelium; the elastin stain clearly shows the internal elastic lamina.  Large collagen bundles and circularly arranged smooth muscle comprise the tunica media.  The tunica adventitia contains longitudinally oriented smooth muscle fibers and collagen.  400x

 - Elastic fibers <p>At higher magnification, the components of the three tunics are evident.  In the tunica intima, smooth muscle fibers are present in the connective tissue beneath the endothelium; the elastin stain clearly shows the internal elastic lamina.  Large collagen bundles and circularly arranged smooth muscle comprise the tunica media.  The tunica adventitia contains longitudinally oriented smooth muscle fibers and collagen.  400x</p>

- Elastic fibers

At higher magnification, the components of the three tunics are evident.  In the tunica intima, smooth muscle fibers are present in the connective tissue beneath the endothelium; the elastin stain clearly shows the internal elastic lamina.  Large collagen bundles and circularly arranged smooth muscle comprise the tunica media.  The tunica adventitia contains longitudinally oriented smooth muscle fibers and collagen.  400x

Smooth muscle fibers <p>At higher magnification, the components of the three tunics are evident.  In the tunica intima, smooth muscle fibers are present in the connective tissue beneath the endothelium; the elastin stain clearly shows the internal elastic lamina.  Large collagen bundles and circularly arranged smooth muscle comprise the tunica media.  The tunica adventitia contains longitudinally oriented smooth muscle fibers and collagen.  400x</p>

Smooth muscle fibers

At higher magnification, the components of the three tunics are evident.  In the tunica intima, smooth muscle fibers are present in the connective tissue beneath the endothelium; the elastin stain clearly shows the internal elastic lamina.  Large collagen bundles and circularly arranged smooth muscle comprise the tunica media.  The tunica adventitia contains longitudinally oriented smooth muscle fibers and collagen.  400x

Collagen <p>At higher magnification, the components of the three tunics are evident.  In the tunica intima, smooth muscle fibers are present in the connective tissue beneath the endothelium; the elastin stain clearly shows the internal elastic lamina.  Large collagen bundles and circularly arranged smooth muscle comprise the tunica media.  The tunica adventitia contains longitudinally oriented smooth muscle fibers and collagen.  400x</p>

Collagen

At higher magnification, the components of the three tunics are evident.  In the tunica intima, smooth muscle fibers are present in the connective tissue beneath the endothelium; the elastin stain clearly shows the internal elastic lamina.  Large collagen bundles and circularly arranged smooth muscle comprise the tunica media.  The tunica adventitia contains longitudinally oriented smooth muscle fibers and collagen.  400x

Image source > <p>Image taken from a slide in the University of Mississippi collection.</p>

Image source >

Image taken from a slide in the University of Mississippi collection.