The Autonomic Nervous System Flashcards
Efferent?
Motor
Afferent?
Sensory
Name to efferent divisions of PNS.
Autonomic
Somatic
Describe the pre and post ganglionic fibres of sympathetic nerves.
Pre- short
Post- long
Which type of outflow do sympathetic nerves have?
Thoracolumbar outflow
Where are sympathetic ganglia located?
Prevertebral ganglia
Paravertebral ganglia
Which level is the sympathetic outflow from?
T1-L2
From which cranial nerves does parasympathetic outflow come from?
III, VII, IX, X
(oculomotor, facial, glossopharyngeal, vagus)
Which level is the parasympathetic outflow from?
S2-4
Describe the pre and post ganglionic fibres of parasympathetic nerves.
Pre-long
Post-short
In the sympathetic nervous system, which type of synapses are between the pre and post-ganglionic cells?
Cholinergic and nicotinic
In the parasympathetic nervous system, which type of synapses are between the pre and post-ganglionic cells?
Cholinergic and nicotinic
In the parasympathetic nervous system, which type of synapses are between the post-ganglionic cells and their targets?
Cholinergic and muscarinic
What does adrenaline and noradrenaline act on?
Alpha or beat adrenergic receptors
What does acetylcholine bind to?
Nicotinic receptors on postganglionic cells
Muscarinic receptors on target
What does noradrenaline bind to?
Alpha or beat adrenergic receptors
In the eye, what does activation of the sympathetic SN cause to the radial and ciliary muscle?
Contraction o radial muscle of iris
Relaxation of ciliary muscle surrounding lens
Which type of receptor are activated on the radial muscle in sympathetic innervation?
Alpha 1 receptors
Which type of receptor are activated on the radial muscle in parasympathetic innervation?
Muscarinic receptors
Which type of receptor are activated on the ciliary muscle in sympathetic innervation?
Beta 2 receptors
Which type of receptor are activated on the ciliary muscle in parasympathetic innervation?
Muscarinic receptors
What may eye drops used to dilate pupil of the eye contain?
Muscarinic antagonist
Alpha 1 agonist
What does parasympathetic innervation cause to happen in the heart?
Release of acetylcholine
Decrease in HR
In blood vessels, was does sympathetic activation cause?
Vasoconstriction
However, in some blood vessels, activation of sympathetic NS causes vasodilation. Why?
They express Beta 2 receptors
->just watch this lecture again before exam for revision
What happens when there is activation of the sympathetic NS in the lungs?
Relaxation of smooth muscle
