An organ's larger arteries and veins flow between its functional units.
Often there is a generous amount of loose fibrous tissue separating an artery and the business cells of the organ. If you're interested in the layers of the arteries, they are:
Media: Middle layer, composed of smooth muscle oriented circumferentially
Adventitia: Fibrous tissue, merging with the surrounding fibrous tissue of the organ.
This is an artery in the testis. The structures at the upper left, lower left, and far right are tubes in which sperms are made. More about these later in the course.
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Kansas City University of Medicine and Biosciences