--- title: "Celiac Ganglia | Anatomy and Physiology I" description: "Celiac Ganglia are paired sympathetic ganglia near the celiac trunk that relay abdominal autonomic signals in Anatomy and Physiology I." canonical: "https://fiveable.me/anatomy-physiology/key-terms/celiac-ganglia" type: "key-term" subject: "Anatomy and Physiology I" unit: "Unit 15" --- # Celiac Ganglia | Anatomy and Physiology I ## Definition The celiac ganglia are a paired set of sympathetic ganglia in the abdomen that send autonomic signals to major digestive organs. In Anatomy and Physiology I, they show how the sympathetic nervous system controls visceral function. ## What It Is The celiac ganglia are paired sympathetic ganglia in the upper abdomen, tucked near the celiac trunk and the front of the aorta. In Anatomy and Physiology I, you usually meet them as part of the autonomic nervous system’s sympathetic pathway to the abdominal organs. Think of them as a relay station. Preganglionic sympathetic fibers travel from the spinal cord, usually from thoracic levels T5 to T12, and synapse in the celiac ganglia. From there, postganglionic fibers carry the message onward to organs like the stomach, liver, pancreas, spleen, and parts of the intestines. That relay matters because sympathetic signaling does not usually target one tiny spot. It changes the whole organ environment, especially during stress, exercise, or fasting. In the abdomen, sympathetic output tends to reduce digestive activity, shift blood flow away from the gut, and adjust glandular secretion. The celiac ganglia are one of the main places where those signals get distributed. The celiac ganglia sit within the prevertebral sympathetic plexus, along with the superior mesenteric and inferior mesenteric ganglia. If your course is tracing nerve pathways, this is where anatomy and function meet: the location of the ganglia explains why they can influence so many abdominal organs at once. One easy way to picture them is to compare them with a switchboard. The spinal cord sends the signal in, the ganglion passes it along, and the target organs respond. If the celiac ganglia are activated, abdominal blood vessels can constrict, and digestive activity can change. If they are damaged or irritated, you may see problems like abnormal gut motility, abdominal pain, or other signs of autonomic dysfunction. ## Why It Matters The celiac ganglia show how the sympathetic nervous system reaches organs that you cannot control consciously. That makes them a great example of the bigger Anatomy and Physiology I theme that structure and function are linked. Once you know where these ganglia sit and what fibers pass through them, the abdominal stress response makes a lot more sense. This term also helps you connect nervous system anatomy to digestive physiology. Instead of memorizing isolated organ facts, you can trace a pathway from the thoracic spinal cord to a ganglion to an abdominal organ and predict the result. That kind of tracing is exactly what A&P questions often ask you to do. It also gives you a way to distinguish sympathetic effects from parasympathetic ones. If an organ is getting strong sympathetic input through the celiac plexus, you should think reduced digestive activity, altered blood flow, and a body-wide response that fits fight-or-flight physiology. ## Connections ### Autonomic Nervous System The celiac ganglia are part of the autonomic nervous system, which controls involuntary functions like digestion and blood pressure. They specifically belong to the sympathetic side, so they carry signals that change organ activity without conscious control. If you can place the ganglia inside the ANS, the pathway makes more sense. ### Sympathetic Division These ganglia are one of the main relay points for sympathetic fibers traveling to the abdomen. That means they are tied to fight-or-flight effects, especially reduced digestive activity and changes in blood vessel diameter. When you trace a sympathetic pathway, the celiac ganglia are a major stop between the spinal cord and the organs. ### [Celiac Trunk](/anatomy-physiology/key-terms/celiac-trunk) The celiac ganglia sit near the celiac trunk, which is a major arterial branch supplying upper abdominal organs. The nearby location is not random, because the nerves and blood vessels travel in the same region of the retroperitoneum. In lab images or diagrams, the celiac trunk is a useful landmark for finding the ganglia. ### [Autonomic Tone](/anatomy-physiology/key-terms/autonomic-tone) Autonomic tone is the baseline level of sympathetic and parasympathetic activity in an organ. The celiac ganglia help shape the sympathetic side of that balance in the digestive organs. If sympathetic tone increases here, you can expect more inhibition of gut function and more blood vessel constriction in the abdominal viscera. ## On the AP Exam A quiz item might give you a diagram of the abdominal sympathetic plexus and ask you to identify where preganglionic fibers synapse before reaching the stomach or liver. You should be able to point to the celiac ganglia and explain that they are sympathetic relay stations near the celiac trunk. On image-based questions, look for the paired ganglia anterior to the aorta and posterior to the stomach. On short-answer or case questions, connect activation of this pathway with decreased digestive activity or abdominal vasoconstriction. If a question asks why a person in a stress response may have slowed digestion, the celiac ganglia are part of the pathway you would trace. ## Celiac Ganglia vs Ciliary Ganglion These sound similar, but they are in very different places and do different jobs. The celiac ganglia are sympathetic ganglia in the abdomen that affect digestive organs, while the ciliary ganglion is in the head and is linked to eye functions. If the question is about abdominal autonomic control, think celiac ganglia. ## Key Takeaways - The celiac ganglia are paired sympathetic ganglia in the upper abdomen near the celiac trunk. - They relay signals from thoracic spinal cord levels T5 to T12 to abdominal organs such as the stomach, liver, pancreas, and intestines. - Their job is to help distribute sympathetic output, especially effects that change digestion and blood flow. - In Anatomy and Physiology I, they are a good example of how a ganglion acts as a relay point in an autonomic pathway. - If you can trace the signal from spinal cord to ganglion to organ, you can answer most questions about this structure. ## FAQs ### What are the celiac ganglia in Anatomy and Physiology I? The celiac ganglia are paired sympathetic ganglia in the upper abdomen. They receive preganglionic input from the thoracic spinal cord and send signals to abdominal organs such as the stomach, liver, and pancreas. ### Where are the celiac ganglia located? They sit in the retroperitoneal space, just anterior to the aorta and near the celiac trunk, behind the stomach. That location is why they show up in diagrams of the upper abdominal autonomic plexus. ### Are the celiac ganglia sympathetic or parasympathetic? They are sympathetic. Their signals are part of the fight-or-flight side of the autonomic nervous system, so they tend to reduce digestive activity and alter blood flow in the abdomen. ### How are the celiac ganglia different from the ciliary ganglion? The celiac ganglia are abdominal sympathetic ganglia, while the ciliary ganglion is in the head and relates to eye function. They are easy to mix up because their names sound alike, but their locations and targets are very different. ## Related Study Guides - [15.1 Divisions of the Autonomic Nervous System ](/anatomy-physiology/unit-15/1-divisions-autonomic-nervous-system/study-guide/qpYZLYuQycoeEYSM) ## About This Document Canonical Fiveable pages are available as Markdown at the same path plus `.md`. - [llms.txt](https://fiveable.me/llms.txt): index of Fiveable's sections and URL patterns - [llms-full.txt](https://fiveable.me/llms-full.txt): complete subject and unit listing - [MCP server](https://fiveable.me/mcp): call Fiveable as tools instead of fetching pages (`https://fiveable.me/api/mcp`) - [MCP server for AP teachers](https://fiveable.me/mcp/teachers): a teacher's classes, assignments and AP-rubric grading (`https://fiveable.me/api/mcp/teacher`) ## Structured Data ```json {"@context":"https://schema.org","@graph":[{"@type":"LearningResource","@id":"https://fiveable.me/anatomy-physiology/key-terms/celiac-ganglia#resource","name":"Celiac Ganglia | Anatomy and Physiology I","url":"https://fiveable.me/anatomy-physiology/key-terms/celiac-ganglia","learningResourceType":"Concept explainer","educationalLevel":"AP® / High School","about":{"@id":"https://fiveable.me/anatomy-physiology/key-terms/celiac-ganglia#term"},"audience":{"@type":"EducationalAudience","educationalRole":"student"},"dateModified":"2026-07-03T02:20:36.800Z","isPartOf":{"@type":"Collection","name":"Anatomy and Physiology I Key Terms","url":"https://fiveable.me/anatomy-physiology/key-terms"},"publisher":{"@type":"Organization","name":"Fiveable","url":"https://fiveable.me"}},{"@type":"DefinedTerm","@id":"https://fiveable.me/anatomy-physiology/key-terms/celiac-ganglia#term","name":"Celiac Ganglia","description":"The celiac ganglia are a paired set of sympathetic ganglia in the abdomen that send autonomic signals to major digestive organs. In Anatomy and Physiology I, they show how the sympathetic nervous system controls visceral function.","url":"https://fiveable.me/anatomy-physiology/key-terms/celiac-ganglia","inDefinedTermSet":{"@type":"DefinedTermSet","name":"Anatomy and Physiology I Key Terms","url":"https://fiveable.me/anatomy-physiology/key-terms"}},{"@type":"FAQPage","mainEntity":[{"@type":"Question","name":"What are the celiac ganglia in Anatomy and Physiology I?","acceptedAnswer":{"@type":"Answer","text":"The celiac ganglia are paired sympathetic ganglia in the upper abdomen. They receive preganglionic input from the thoracic spinal cord and send signals to abdominal organs such as the stomach, liver, and pancreas."}},{"@type":"Question","name":"Where are the celiac ganglia located?","acceptedAnswer":{"@type":"Answer","text":"They sit in the retroperitoneal space, just anterior to the aorta and near the celiac trunk, behind the stomach. That location is why they show up in diagrams of the upper abdominal autonomic plexus."}},{"@type":"Question","name":"Are the celiac ganglia sympathetic or parasympathetic?","acceptedAnswer":{"@type":"Answer","text":"They are sympathetic. Their signals are part of the fight-or-flight side of the autonomic nervous system, so they tend to reduce digestive activity and alter blood flow in the abdomen."}},{"@type":"Question","name":"How are the celiac ganglia different from the ciliary ganglion?","acceptedAnswer":{"@type":"Answer","text":"The celiac ganglia are abdominal sympathetic ganglia, while the ciliary ganglion is in the head and relates to eye function. They are easy to mix up because their names sound alike, but their locations and targets are very different."}}]},{"@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Anatomy and Physiology I","item":"https://fiveable.me/anatomy-physiology"},{"@type":"ListItem","position":2,"name":"Key Terms","item":"https://fiveable.me/anatomy-physiology/key-terms"},{"@type":"ListItem","position":3,"name":"Unit 15","item":"https://fiveable.me/anatomy-physiology/unit-15"},{"@type":"ListItem","position":4,"name":"Celiac Ganglia"}]}]} ```