10- Abdominal Autonomics & Pain Flashcards
Autonomic Plexuses are collections of sympathetic __________ axons and parasympathetic __________ axons, as well as some visceral sensory axons.
Postganglionic
Preganglionic
This autonomic plexus consists of the Celiac Plexus, Superior Mesenteric Plexus, and Inferior Mesenteric Plexus. It provides autonomic control of digestion.
Abdominal Aortic Plexus
This autonomic plexus innervates the pelvic viscera. It provides autonomic control oof the urinary and reproductive functions.
Hypogastric Plexuses (Superior and Inferior)
Briefly describe the parasympathetic pathway.
Begins craniosacral with a long preganglionic fiber that releases ACh. Synapses onto ganglia close to the target organ. Short postganglionic fibers also release ACh.
Briefly describe the sympathetic pathway.
Begins thoracolumbar with a short preganglionic fiber that releases ACh. Synapses in sympathetic trunk ganglia (paravertebral) or passes through and goes to other ganglia (prevertebral). Long post ganglion fibers go to target organs and release NE.
The Abdominopelvic Splanchnic Nerves synapse on what prevertebral ganglia?
Celiac Ganglion
Aorticorenal Ganglion
Superior Mesenteric Ganglion
Inferior Mesenteric Ganglion
Fight-or-Flight function of the ANS may involve a single effector or many effectors. In ________ ________, a large number of ganglionic neurons activate many effector organs. This causes a heightened sense of alertness due to stimulation of the reticular activation system.
Mass Activation
Sympathetic preganglionic neuron cell bodies are housed in the lateral horn of the ________ regions of the spinal cord.
T1-L2
Preganglionic sympathetic axons travel with the somatic motor neuron axons to exit the spinal cord and first enter the (ANTERIOR/POSTERIOR) roots and then the T1-L2 spinal nerves.
Anterior
Immediately anterior to the paired spinal nerves are the left and right ________ ________. Each is located immediately lateral to the vertebral column.
Sympathetic Trunks
A sympathetic trunk looks much like a string of beads. The (BEADS/STRING) are composed of bundles of axons. The (BEADS/STRING) are the sympathetic trunk (or paravertebral) ganglia, which house sympathetic ganglionic neuron cell bodies.
String
Beads
T/F. One sympathetic trunk ganglion is approximately associated with each spinal nerve.
True
As opposed to the eight cervical spinal nerves, the cervical portion of each sympathetic trunk is partitioned into only three sympathetic trunk ganglia, which are…
Superior Cervical Ganglion
Middle Cervical Ganglion
Inferior Cervical Ganglion
Connecting the spinal nerves to each sympathetic trunk are ________ ________ ________. They carry preganglionic sympathetic axons from the T1-L2 spinal nerves to the sympathetic trunk. They are only associated with the T1-L2 spinal nerves. Similar to “entrance ramps” on a highway.
White Rami Communicantes
Preganglionic axons are __________, which is why the white ramus has a whitish appearance.
Myelinated
The ________ ________ ________ carry postganglionic sympathetic axons from the sympathetic trunk to the spinal nerve. Axons are unmyelinated. Similar to “exit ramps” on a highway.
Gray Rami Communicantes
(WHITE/GRAY) Rami connect to all spinal nerves, including the cervical, sacral, and coccygeal spinal nerves. In this way, sympathetic information that started out in the thoracolumbar region can be dispersed to all parts of the body.
Gray
What are the sympathetic pathways (4)?
Spinal Nerve Pathway
Postganglionic Sympathetic Nerve Pathway
Splanchnic Nerve Pathway
Adrenal Medulla Pathway
***Review slides 26-31! Pretty self explanatory
Splanchnic nerves serving the abdomen and pelvis are composed of _________ sympathetic axons. They run anteriorly from the sympathetic trunk to most of the viscera. Should NOT be confused with the pelvic splanchnic nerves associated with parasympathetic division nor with cardiopulmonary splanchnic nerves!
Preganglionic
Splanchnic nerves (all of these are SYMPATHETIC) have specific names, which are…
Greater Thoracic Splanchnic Nerves Lesser Thoracic Splanchnic Nerves Least Thoracic Splanchnic Nerves Lumbar Splanchnic Nerves Sacral Splanchnic Nerves
Splanchnic nerves terminate in _________ ganglia. They are called this because they are immediately anterior to the vertebral column on the anterolateral wall of the abdominal aorta.
Prevertebral
The parasympathetic division is also called the _________ division. Primarily concerned with conserving energy and replenishing nutrient stores. Is most active when the body is at rest or digesting a meal.
Craniosacral
The _______ _______ is the source of parasympathetic stimulation for the thoracic and most abdominal organs to the left colic (splenic) flexure.
Vagus Nerve
_______ _______ _______ take over parasympathetic innervation for the distal gut tube and the pelvic viscera.
Pelvic Splanchnic Nerves (S2-S4)
The Vagus N. has what parasympathetic effects on the following? —
- Heart
- Respiratory Organs
- Bronchial Passages
- Esophagus
- Abdominal Viscera
– Decreases heart rate
– Decreases respiration
– Constricts bronchial passages, excites mucous production
– Promotes swallowing and peristalsis
– Promotes digestion