Which nerves regulate vessel diameter?

1. Small nerves run within the vessel walls. 2. Their name means nerves of the vessel. 3. Vasoconstriction and vasodilation are regulated in part by small vascular nerves known as nervi vasorum. 4. So the answer is nervi vasorum. _Source: OpenStax 'Anatomy and Physiology 2e', Ch 20 'The Cardiovascular System: Blood Vessels and Circulation'_