What is the function of the iliohypogastric nerve in the lower abdomen?

The iliohypogastric nerve is primarily responsible for innervating the skin over the anterior and lateral regions of the lower abdomen. This nerve emerges from the lumbar plexus and travels to provide sensory innervation in these areas, allowing for the perception of touch, temperature, and pain. Specifically, it plays a crucial role in the sensory supply of the skin in the lower abdominal area, particularly above the pubic region.

While it does contribute to the innervation of some abdominal muscles as well, the key function of the iliohypogastric nerve is its sensory role, particularly regarding the skin. The other options do not accurately represent the primary functions associated with this nerve, focusing instead on areas that it does not innervate or functions it does not primarily serve.