The ANS Flashcards
Describe, in terms of myelination, preganglionic and postganglionic fibres.
Small and myelinated.
Unmyelinated.
What receptors are used in the ANS?
Metabotropic receptors (that may excite or inhibit the target).
What regions does outflow occur in the sympathetic and parasympathetic nervous systems?
Thoracolumbar.
Craniosacral.
What types of sympathetic ganglia exist?
Paravertebral - close to the spinal cord.
Prevertebral - in collateral ganglia.
Describe the relative location of parasympathetic ganglia.
Close to or within the target.
What receptors does ACh act on?
Cholinergic.
Nicotinic or muscarinic.
What receptors does noradrenaline act on?
Adrenergic.
Alpha or beta.
Preganglionic fibres release _____. This acts on _____ _____ receptors.
1 - acetylcholine.
2 - nicotinic cholinergic.
Parasympathetic postganglionic fibres release _____. This acts on _____ _____ receptors.
1 - acetylcholine.
2 - muscarinic cholinergic.
Sympathetic postganglionic fibres release _____. This acts on _____ _____ receptors.
1 - noradrenaline.
2 - alpha and beta adrenergic.
Sympathetic postganglionic cells of the _____ _____ release _____ _____ into the blood. This acts on _____ _____ receptors.
1 - adrenal medulla.
2 - adrenaline and noradrenaline.
3 - alpha and beta adrenergic.
What system has short preganglionic fibres and long postganglionic fibres?
Sympathetic.
What system has long preganglionic fibres and short postganglionic fibres?
Parasympathetic.
What are varicosities?
Bumps on postganglionic fibres.
Releases NTs along the target in the ISF.
One fibre innervates many cells.
What are NANCs?
Non-adrenergic non-cholinergic transmitters (such as peptides). They are used by postganglionic fibres and can be released with ACh or noradrenaline.
