The parasympathetic branch uses terminal ganglion basal ganglia prevertebral ganglion myelinated ganglion
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What type of ganglia belongs to the parasympathetic nervous system? Splanchnic ganglia Postvertebral ganglia Prevertebral ganglia Terminal ganglia
Adi S.
The parasympathetic nervous system is characterized by long postganglionic axons and the absence of preganglionic fibers. Short postganglionic axons innervate organs within the body, while short preganglionic axons are located near the spinal cord. Sympathetic preganglionic axons can synapse with cells in the adrenal cortex, either in the chain or collateral ganglia. They can also synapse in parasympathetic ganglia, tenina ganglia, or the dorsal root ganglion. The celiac, superior mesenteric, and inferior mesenteric ganglia are collateral parasympathetic chain ganglia. Stimulation of the postganglionic cells of the adrenal medulla leads to the release of epinephrine and norepinephrine, as well as cortisol. The vagus nerve carries parasympathetic impulses to the thyroid gland, lacrimal glands, salivary glands, and smooth muscle of the eyes.
The parasympathetic nervous system is also known as the craniosacral division of the ANS. The preganglionic fibers exit the CNS at the brainstem and sacral region of the spinal cord. An example of a parasympathetic pathway is the innervation of the heart. The preganglionic nerve fibers carry action potentials from the brain toward the heart. These fibers pass through the cardiac plexus and end at terminal ganglia, where secretion of the neurotransmitter acetylcholine stimulates an action potential in the postganglionic fiber. Since the postganglionic fibers are long compared to the preganglionic fibers, impulses arrive relatively quickly at the heart tissue. The postganglionic fibers synapsing on cells in the heart release the neurotransmitter acetylcholine. This parasympathetic neurotransmitter causes the heart rate and cardiac contraction to decrease.
Madhur L.
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