Peripheral nervous system Flashcards
Function of afferent neurons?
Convey info from sensory receptors to CNS
First order neurons
What carries info from sensory receptors to CNS?
Afferent neurons
Function of efferent neurons?
Convey info from CNS to muscles, glands, tissues
What conveys info from CNS to muscles, glands, tissues?
Efferent neurons
What is nervous system split into? Draw?
What is CNS split into?
Brain
Spinal cord
What is peripheral nervous system split into?
Autonomic nervous system
Somatic nervous system
What is autonomic nervous system split into?
Sympathetic
Parasympathetic
What is para and sympathetic system part of?
Autonomic nervous system
What is peripheral system divided into?
Somatic
Autonomic
What is function somatic nervous system?
Voluntary action
What does somatic nervous system innervate?
Skeletal muscle
Muscle excitation
What is somatic nervous system made of?
Single neuron between CNS and skeletal muscle cell
Where are cell bodies of somatic nervous system located? (2)
Brainstem
Ventral horn spinal cord
Are neurons myelinated in somatic nervous system?
Yes
What neurons cause contraction muscle?
Motor neurons
What neurotransmitter is involved in somatic nervous system?
Acetylcholine (Ach)
What neurotransmitter is involved in somatic nervous system?
Acetylcholine (Ach)
What is function autonomic nervous system?
Involuntary ns
What does autonomic ns innervate?
Smooth and cardiac muscle, glands
How many neurons in autonomic ns?
2 neuron chain
Between CNS and effector organ
Where is cell body of first neuron in autonomic ns?
Cell body in CNS
Synapse occur outside CNS
Is autonomic excitatory or inhibitory?
Both
What two divisions of autonomic nervous system?
Sympathetic
Parasympathetic
What neurotransmitters are used in autonomic ns?
Ach (excitatory)
Noradrenaline (inhib)
What is sympathetic ns part of?
Autonomic ns
Function of sympathetic ns?
Fight or flight
Where does sympathetic ns leave CNS?
T1-L2
In sympathetic ns what neurotransmitter/receptor used at preganglionic synapses?
Nicotinic receptor
Ach
In sympathetic ns what neurotransmitter/receptor used at effector cell?
Adrenergic receptor
Noradrenaline
Give examples of sympathetic ns function?
Increased heart rate
Increased force of heart contraction
Vasoconstriction
Bronchodilation
Reduces gastric motility
Sphincter contraction
Male ejaculation
What effect does adrenal glands have on sympathetic ns?
Eg
Amplify
Release adrenaline- increase HR and BP
What is parasympathetic ns part of?
Autonomic ns
What is function parasympathetic ns?
Rest and digest
What cranial nerves are parasympathetic?
1, 3, 7, 9
What neurotransmitter used in parasympathetic ns?
ACh
What receptor is present at preganglionic synapse?
Nicotinic receptor
What receptor present at effector cell synapse?
Muscarinic receptor
List effect parasympathetic nervous system?
Decreased heart rate
Decreased force of heart contraction
Vasodilation
Bronchoconstriction
Increased gastric motility
Sphincter relaxation
Male erection
What is ns of GI tract?
Enteric nervous system
What is enteric nervous system?
Nervous system of GI tract
State differences between autonomic and somatic nervous sytem
Outline diff nervous sytems
