What is the expected response of cavernous arteries following injection during an assessment?

In the context of assessing cavernous arteries, an increase in size following injection is expected due to the physiological response of these arteries to a vasodilatory agent. When a substance, such as a contrast agent or a medication, is injected into the cavernous arteries, it typically enhances blood flow as a result of increased vascular permeability and relaxation of smooth muscle.

This response leads to the dilation of the arteries, resulting in a measurable increase in their size. The increase signifies an effective response to the injected agent, indicating normal vascular function in the cavernous region. Such changes can be critical in evaluating conditions like erectile dysfunction, where blood supply dynamics play an essential role in physiological response.

Other options, such as a decrease in size or immediate collapse, would reflect an inadequate response or potential pathology within the vascular structure, which is not aligned with the expected physiological outcome associated with the assessment of cavernous arteries.