Innervation of Abdominal Viscera: Regulation of G-I Function and Pain Perception Flashcards
For sympathetic innervation with the T5-9 (or 10) spinal cor segment, what is the
- ) Pre-ganglionic splanchnic nerve
- ) Prevertebral ganglion
- ) Greater splanchnic nerve
2. ) Celiac ganglion
For sympthetic innervation with the T10-11 spinal cord segment what is the
- ) Pre-ganglionic splanchnic nerve
- ) Prevertebral ganglion
- ) Lesser Splanchnic nerve
2. ) Superior mesenteric (or aorticorenal) ganglia
For sympathetic innervation with the T12 spinal cord segment, what is the
- ) Pre-ganglionic splanchnic nerve
- ) Prevertebral ganglion
- ) Least Splanchnic nerve
2. ) Aorticorenal (or cell bodies in renal plexus) ganglia
For sympathetic innervation with the L1-2 spinal cord segment, what is the
- ) Pre-ganglionic splanchnic nerve
- ) Prevertebral ganglion
- ) Lumbar Splanchnic nerve
2. ) Inferior mesenteric ganglia
What is the destination of the sympathetic innervation from
- ) T5-6
- ) T7-9
- ) T6-10
- ) Abdominal esophagus
- ) Liver and biliary tree
- ) Stomach, spleen, pancreas, and proximal duodenum
What is the destination of the sympathetic innervation from
- ) T9-T10
- ) T10
- ) T10-T11
- ) Distal duodenum, pancreas, jejunum, and ileum
- ) Appendix
- ) Proximal colon
What is the destination of the sympathetic innervation from
- ) T12
- ) L1-2
- ) Proximal colon
2. ) Distal colon
Pain and pressure afferents follow
-sensitive to distension
Sympathetic pathways
What is the function of sympathetic G-I innervation?
Decreases motility and secretion
Site of synapse in intestinal wall for foregut and midgut
Myenteric and submucous plexuses
Site of synapse in intestinal wall for hindgut
Enteric plexuses
What is the function of parasympathetic G-I innervation?
Increases motility and secretion
What are the two preganglionic nerves of parasympathetic G-I innervation?
- ) Vagus nerve trunks
2. ) S2-4 ventral rami
For the vagus nerve trunks, what is the autonomic plexus?
Celiac plexus and superior mesenteric plexus
For the S2-4 ventral rami, what is the autonomic plexus?
Inferior hypogastric plexus
What is the destination of innervation from the vagus nerve trunks?
Esophagus through proximal 2/3 of transverse colon
Synapse within alimentary tract from esophagus through proximal 2/3 of transverse colon
Intrinsic (enteric) Ganglia
What is the destination of innervation from the S2-4 ventral rami?
Distal 1/3 of transverse colon to rectum
Synapse within alimentary tract from distal 1/3 of transverse colon to rectum
Intrinsic (enteric) Ganglia
Reflex afferents follow
Parasympathetic pathways
The system of neurons and their supporting cells that is found within the walls of the alimentary tract
Enteric Nervous System
Neurons are within ganglia in
Intrinsic plexuses
The main plexuses which contain neurons in ganglia are the
Myenteric (Auerbach’s) and Submucosal (Meissner’s)
The myenteric (Auerbach’s) plexus is between the
Longituginal and circular muscles
The submucosal (Meissner’s) plexus is between the
Circular muscle and muscularis mucosae
Synapse with cells in the same or other ganglia
Intrinsic neurons
Intrinsic neurons project to effectors in the walls of the
Alimentary tract (e.g. muscle, mucosae)
Outside the walls of the alimentary tract, intrinsic neurons connect with
Autonomic ganglia
Intrinsic neurons send afferents to the
CNS
Intrinsic neurons innervate
Mesenteric arteries and arterioles of the colon
Governs the normal motility and secretory functions of the intestine
Enteric nervous system