Splanchnic nerves: Difference between revisions

Latest revision as of 10:52, 15 February 2025

Splanchnic Nerves[edit]

The splanchnic nerves are a group of nerves that innervate the visceral organs. They are part of the autonomic nervous system and are primarily involved in the regulation of the gastrointestinal tract, kidneys, and other abdominal organs. The splanchnic nerves are classified into three main groups: the greater, lesser, and least splanchnic nerves.

Greater Splanchnic Nerve[edit]

The greater splanchnic nerve arises from the thoracic sympathetic ganglia, typically from the fifth to the ninth thoracic vertebrae. It descends through the thorax and pierces the diaphragm to reach the celiac ganglion. The greater splanchnic nerve primarily provides sympathetic innervation to the stomach, liver, pancreas, and spleen.

Lesser Splanchnic Nerve[edit]

The lesser splanchnic nerve originates from the tenth and eleventh thoracic sympathetic ganglia. It also travels through the diaphragm to reach the superior mesenteric ganglion. This nerve supplies the small intestine and the initial portions of the large intestine.

Least Splanchnic Nerve[edit]

The least splanchnic nerve is the smallest of the three and arises from the twelfth thoracic sympathetic ganglion. It innervates the kidneys and the adrenal glands.

Function[edit]

The primary function of the splanchnic nerves is to convey autonomic signals to the abdominal organs. They carry both sympathetic and parasympathetic fibers, although the sympathetic component is more prominent. These nerves play a crucial role in regulating blood flow, digestive processes, and metabolic functions of the visceral organs.

Clinical Significance[edit]

Damage or dysfunction of the splanchnic nerves can lead to various clinical conditions, such as abdominal pain, hypertension, and digestive disorders. Understanding the pathways and functions of these nerves is essential for diagnosing and treating such conditions.

Related Pages[edit]

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-'''Splanchnic nerves''' are paired visceral nerves (nerves that contribute to the innervation of the internal organs), carrying fibers of the autonomic nervous system (visceral efferent fibers) as well as sensory fibers from the organs (visceral afferent fibers). All carry sympathetic fibers except for the pelvic splanchnic nerves, which carry parasympathetic fibers.
+== Splanchnic Nerves ==
-==Etymology==
+[[File:Gray839.png|thumb|right|Diagram of the splanchnic nerves.]]
-The term "splanchnic" comes from the Greek word "splanchna," which means "entrails" or "internal organs." This reflects the nerves' function in innervating the body's internal organs.
-==Types of Splanchnic Nerves==
+The '''splanchnic nerves''' are a group of nerves that innervate the visceral organs. They are part of the [[autonomic nervous system]] and are primarily involved in the regulation of the [[gastrointestinal tract]], [[kidneys]], and other abdominal organs. The splanchnic nerves are classified into three main groups: the greater, lesser, and least splanchnic nerves.
-There are several types of splanchnic nerves, including:
-* [[Thoracic splanchnic nerves]]: These nerves include the greater, lesser, and least splanchnic nerves. They arise from the sympathetic trunk in the thorax and travel to the celiac ganglion and superior mesenteric ganglion.
+=== Greater Splanchnic Nerve ===
-* [[Lumbar splanchnic nerves]]: These nerves arise from the sympathetic trunk in the lumbar region and travel to the inferior mesenteric ganglion.
+The [[greater splanchnic nerve]] arises from the thoracic sympathetic ganglia, typically from the fifth to the ninth thoracic vertebrae. It descends through the thorax and pierces the diaphragm to reach the [[celiac ganglion]]. The greater splanchnic nerve primarily provides sympathetic innervation to the [[stomach]], [[liver]], [[pancreas]], and [[spleen]].
-* [[Sacral splanchnic nerves]]: These nerves arise from the sympathetic trunk in the sacral region and travel to the inferior hypogastric plexus.
-* [[Pelvic splanchnic nerves]]: These nerves arise from the second, third, and fourth sacral spinal nerves and carry parasympathetic fibers to the hindgut.
-==Function==
+=== Lesser Splanchnic Nerve ===
-The splanchnic nerves are responsible for innervating the viscera, carrying sympathetic fibers to the body's internal organs. The specific functions of the splanchnic nerves vary depending on the region of the body they serve. For example, the thoracic splanchnic nerves are involved in the regulation of heart rate and blood pressure, while the lumbar splanchnic nerves are involved in the regulation of the digestive system.
+The [[lesser splanchnic nerve]] originates from the tenth and eleventh thoracic sympathetic ganglia. It also travels through the diaphragm to reach the [[superior mesenteric ganglion]]. This nerve supplies the [[small intestine]] and the initial portions of the [[large intestine]].
-==Clinical Significance==
+=== Least Splanchnic Nerve ===
-Damage to the splanchnic nerves can result in a variety of disorders, including [[splanchnic nerve neuropathy]], which can cause severe abdominal pain. Treatment for this condition may include nerve blocks or surgical removal of the affected nerves.
+The [[least splanchnic nerve]] is the smallest of the three and arises from the twelfth thoracic sympathetic ganglion. It innervates the [[kidneys]] and the [[adrenal glands]].
-==See Also==
+=== Function ===
+The primary function of the splanchnic nerves is to convey autonomic signals to the abdominal organs. They carry both [[sympathetic]] and [[parasympathetic]] fibers, although the sympathetic component is more prominent. These nerves play a crucial role in regulating [[blood flow]], [[digestive processes]], and [[metabolic functions]] of the visceral organs.
+=== Clinical Significance ===
+Damage or dysfunction of the splanchnic nerves can lead to various clinical conditions, such as [[abdominal pain]], [[hypertension]], and [[digestive disorders]]. Understanding the pathways and functions of these nerves is essential for diagnosing and treating such conditions.
+== Related Pages ==
 * [[Autonomic nervous system]]
 * [[Sympathetic nervous system]]
 * [[Parasympathetic nervous system]]
+* [[Celiac ganglion]]
+* [[Superior mesenteric ganglion]]
-[[Category:Anatomy]]
+[[Category:Autonomic nervous system]]
-[[Category:Nervous system]]
+[[Category:Peripheral nervous system]]
-[[Category:Medical terminology]]
-{{stub}}