Which layer secures the vessel to surrounding body tissue?

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Multiple Choice

Which layer secures the vessel to surrounding body tissue?

Explanation:
The outermost connective tissue layer anchors the vessel to surrounding tissues. This tunica adventitia is rich in collagen and elastin, blending with nearby connective tissue to secure the vessel in place and provide structural support. In larger vessels it may also contain the vasa vasorum, but its primary role is attachment rather than controlling diameter or lining the lumen. The inner layers—the tunica media with smooth muscle and the tunica intima with the endothelial lining—are involved in regulation of flow and maintaining a smooth inner surface, not anchoring the vessel.

The outermost connective tissue layer anchors the vessel to surrounding tissues. This tunica adventitia is rich in collagen and elastin, blending with nearby connective tissue to secure the vessel in place and provide structural support. In larger vessels it may also contain the vasa vasorum, but its primary role is attachment rather than controlling diameter or lining the lumen. The inner layers—the tunica media with smooth muscle and the tunica intima with the endothelial lining—are involved in regulation of flow and maintaining a smooth inner surface, not anchoring the vessel.

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