Arteriole, longitudinal section
CARDIOVASCULAR IMAGE INDEX / CARDIOVASCULAR STUDY GUIDE
This image illustrates a longitudinally-sectioned arteriole.
Note the distinctive appearance of endothelial and smooth muscle nuclei. Because smooth muscle fibers encircle the vessel, when the arteriole is sectioned longitudinally, the elongated (cigar-shaped) nucleus of each muscle cell is cut in cross-section and thus appears small and round.
The tissue around the vessel is fibrous connective tissue of deep dermis (skin).
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Last updated: 5 September 2003 / dgk