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:

Intima: Inner layer, the endothelium, a bit of collagen, and perhaps a few other inconspicuous cells

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.

With your study partners, find:

• the artery (only the muscularis is easy to see)


• the surrounding loose fibrous tissue

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Kansas City University of Medicine and Biosciences