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Large vein

This longitudinal section of a large vein was stained for elastic fibers (black).  The wall of a large vein is variable depending on its location.  Here, in the vena cava, longitudinally oriented smooth muscle is present in tunica intima and adventitia.  In this orientation, the circularly arranged smooth muscle in the tunica media is seen in cross section.  An internal elastic lamina is present.  100x

Lumen <p>This longitudinal section of a large vein was stained for elastic fibers (black).  The wall of a large vein is variable depending on its location.  Here, in the vena cava, longitudinally oriented smooth muscle is present in tunica intima and adventitia.  In this orientation, the circularly arranged smooth muscle in the tunica media is seen in cross section.  An internal elastic lamina is present.  100x</p>

Lumen

This longitudinal section of a large vein was stained for elastic fibers (black).  The wall of a large vein is variable depending on its location.  Here, in the vena cava, longitudinally oriented smooth muscle is present in tunica intima and adventitia.  In this orientation, the circularly arranged smooth muscle in the tunica media is seen in cross section.  An internal elastic lamina is present.  100x

Tunica intima <p>This longitudinal section of a large vein was stained for elastic fibers (black).  The wall of a large vein is variable depending on its location.  Here, in the vena cava, longitudinally oriented smooth muscle is present in tunica intima and adventitia.  In this orientation, the circularly arranged smooth muscle in the tunica media is seen in cross section.  An internal elastic lamina is present.  100x</p>

Tunica intima

This longitudinal section of a large vein was stained for elastic fibers (black).  The wall of a large vein is variable depending on its location.  Here, in the vena cava, longitudinally oriented smooth muscle is present in tunica intima and adventitia.  In this orientation, the circularly arranged smooth muscle in the tunica media is seen in cross section.  An internal elastic lamina is present.  100x

 - Internal elastic lamina <p>This longitudinal section of a large vein was stained for elastic fibers (black).  The wall of a large vein is variable depending on its location.  Here, in the vena cava, longitudinally oriented smooth muscle is present in tunica intima and adventitia.  In this orientation, the circularly arranged smooth muscle in the tunica media is seen in cross section.  An internal elastic lamina is present.  100x</p>

- Internal elastic lamina

This longitudinal section of a large vein was stained for elastic fibers (black).  The wall of a large vein is variable depending on its location.  Here, in the vena cava, longitudinally oriented smooth muscle is present in tunica intima and adventitia.  In this orientation, the circularly arranged smooth muscle in the tunica media is seen in cross section.  An internal elastic lamina is present.  100x

Tunica media <p>This longitudinal section of a large vein was stained for elastic fibers (black).  The wall of a large vein is variable depending on its location.  Here, in the vena cava, longitudinally oriented smooth muscle is present in tunica intima and adventitia.  In this orientation, the circularly arranged smooth muscle in the tunica media is seen in cross section.  An internal elastic lamina is present.  100x</p>

Tunica media

This longitudinal section of a large vein was stained for elastic fibers (black).  The wall of a large vein is variable depending on its location.  Here, in the vena cava, longitudinally oriented smooth muscle is present in tunica intima and adventitia.  In this orientation, the circularly arranged smooth muscle in the tunica media is seen in cross section.  An internal elastic lamina is present.  100x

 - Smooth muscle (cross section) <p>This longitudinal section of a large vein was stained for elastic fibers (black).  The wall of a large vein is variable depending on its location.  Here, in the vena cava, longitudinally oriented smooth muscle is present in tunica intima and adventitia.  In this orientation, the circularly arranged smooth muscle in the tunica media is seen in cross section.  An internal elastic lamina is present.  100x</p>

- Smooth muscle (cross section)

This longitudinal section of a large vein was stained for elastic fibers (black).  The wall of a large vein is variable depending on its location.  Here, in the vena cava, longitudinally oriented smooth muscle is present in tunica intima and adventitia.  In this orientation, the circularly arranged smooth muscle in the tunica media is seen in cross section.  An internal elastic lamina is present.  100x

Tunica adventitia <p>This longitudinal section of a large vein was stained for elastic fibers (black).  The wall of a large vein is variable depending on its location.  Here, in the vena cava, longitudinally oriented smooth muscle is present in tunica intima and adventitia.  In this orientation, the circularly arranged smooth muscle in the tunica media is seen in cross section.  An internal elastic lamina is present.  100x</p>

Tunica adventitia

This longitudinal section of a large vein was stained for elastic fibers (black).  The wall of a large vein is variable depending on its location.  Here, in the vena cava, longitudinally oriented smooth muscle is present in tunica intima and adventitia.  In this orientation, the circularly arranged smooth muscle in the tunica media is seen in cross section.  An internal elastic lamina is present.  100x

Smooth muscle (longitudinal section) <p>This longitudinal section of a large vein was stained for elastic fibers (black).  The wall of a large vein is variable depending on its location.  Here, in the vena cava, longitudinally oriented smooth muscle is present in tunica intima and adventitia.  In this orientation, the circularly arranged smooth muscle in the tunica media is seen in cross section.  An internal elastic lamina is present.  100x</p>

Smooth muscle (longitudinal section)

This longitudinal section of a large vein was stained for elastic fibers (black).  The wall of a large vein is variable depending on its location.  Here, in the vena cava, longitudinally oriented smooth muscle is present in tunica intima and adventitia.  In this orientation, the circularly arranged smooth muscle in the tunica media is seen in cross section.  An internal elastic lamina is present.  100x