Autonomic nervous system Flashcards
What are autonomic sensory components?
Receptors Viscera Not consciously perceived e.g. baroreceptors Somatosensory External environment
What do autonomic motor nerves innervate?
Smooth muscle
Cardiac muscle
Glands
What are the divisions of the autonomic nervous system?
Parasympathetic
Sympathetic
What is different in the organisation of autonomic and somatic motor neurones?
Somatic has 1 neurone between CNS and effector
Autonomic has 2 neurones between CNS and effector
What are the two nerves in an autonomic motor pathway?
Pre ganglionic
Post ganglionic
What are the neurotransmitters of the sympathetic nervous system?
Ach and NA
What are the neurotransmitters of the parasympathetic nervous system?
Ach and Ach
What is an exception to the neurotransmitter rule?
Sweat glands innervated by the sympathetic nervous system are only Ach
The adrenal medulla is innervated by one sympathetic neurone not two
What is a brief summary of the sympathetic and parasympathetic nervous system?
Sympathetic: alert and active
Parasympathetic: rest and digest
Are organs innervated by the sympathetic or parasympathetic?
Both
Antagonists of one another
Describe autonomic innervation of the heart
SNS: increases heart rate
PNS: decreases heart rate
Describe innervation of the stomach
SNS: decreases motility
PNS: increases motility
Describe innervation of the pupil
SNS: contraction of radial muscle dilates the pupil
PNS: contraction of circular muscle constricts the pupil
What is only innervated by the sympathetic nervous system?
Sweat glands
Most blood vessels
What is the effect of the sympathetic nervous system on most blood vessels?
More activity = vasoconstriction
Less activity = vasoldilation
