**Core Concept**
The inferior hypogastric plexus is a complex network of nerve fibers that play a crucial role in the autonomic innervation of the pelvic organs. It is a part of the autonomic nervous system, specifically the sympathetic and parasympathetic divisions, which regulate various functions such as digestion, urination, and reproduction.

**Why the Correct Answer is Right**
The inferior hypogastric plexus is located on the lateral wall of the rectum, extending from the level of the sacral promontory to the level of the upper border of the pubic symphysis. It is formed by the convergence of the sympathetic and parasympathetic fibers from the lumbar and sacral spinal cord. The plexus is composed of nerve fibers that arise from the superior hypogastric plexus, which is located near the aortic bifurcation. The inferior hypogastric plexus then branches out to innervate the pelvic organs, including the rectum, bladder, and reproductive organs.

**Why Each Wrong Option is Incorrect**
**Option A:** The aorta is a major artery that arises from the left ventricle of the heart and descends through the thoracic and abdominal cavities. The inferior hypogastric plexus is not located anterior to the aorta, but rather in the pelvic region.

**Option B:** The kidneys are located in the retroperitoneal space, near the lumbar vertebrae, and are not directly related to the location of the inferior hypogastric plexus.

**Option C:** The anterior abdominal wall is a layer of tissue that separates the abdominal cavity from the external environment. The inferior hypogastric plexus is not located between the layers of the anterior abdominal wall, but rather in the pelvic region.

**Clinical Pearl / High-Yield Fact**
The inferior hypogastric plexus is an important landmark in pelvic surgery, as damage to this plexus can result in urinary retention, fecal incontinence, and other autonomic dysfunction.

**✓ Correct Answer: D. On the side of rectum**