Coeliac plexus is located
**Core Concept**
The coeliac plexus, also known as the solar plexus, is a complex network of **nerves** and **ganglia** that plays a crucial role in the autonomic nervous system. It is involved in the innervation of various abdominal organs. The coeliac plexus is located in the abdominal region, surrounding the **coeliac artery** and **superior mesenteric artery**.
**Why the Correct Answer is Right**
The coeliac plexus is indeed located at the level of the **L1** vertebra, surrounding the **coeliac trunk** and **superior mesenteric artery**. This plexus is formed by the **sympathetic** and **parasympathetic nerves** that arise from the **vagus nerve** and the **thoracic splanchnic nerves**. The coeliac plexus is responsible for regulating various physiological functions, including **digestion** and **blood flow** to the abdominal organs.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the coeliac plexus is not located in the thoracic region.
**Option B:** This option is incorrect because the coeliac plexus is not located in the pelvic region.
**Option D:** This option is incorrect because the coeliac plexus is specifically located at the level of the L1 vertebra.
**Clinical Pearl / High-Yield Fact**
The coeliac plexus is a key target for **neurolytic blocks** and **anesthetic injections** in patients with severe abdominal pain, particularly those with **pancreatic cancer**.
**Correct Answer: C.** at the level of L1 vertebra