Peripheral Nervous System Flashcards
(23 cards)
What is the endoneurium?
Surrounds each axon
What is the perineurium?
Surrounds each fascicle
What is the epineurium?
Surrounds each neuron/nerve
Surrounds each neuron/nerve
Epineurium
Surrounds each fascicle
Perineurium
Surrounds each axon
Endoneurium
Can nerves regenerate?
Cell body = no
Axon = yes
How fast is peripheral nerve regeneration?
1.5 mm / day
What do sensory receptors do?
Respond to stimuli (changes in environment)
What is the difference between sensation and perception?
Sensation = aware of stimulus Perception = interpretation (understand) stimulus
How are different receptors classified?
- Type of stimulus they detect
- Body location
- Structural complexity
Based on the type of stimulus they detect, what are the 5 types of receptor?
Mechanoreceptor (mechanical force) Thermoreceptor (hot and cold) Photoreceptor (light) Chemoreceptor (chemicals) Nocireceptor (pain)
Based on body location, what are the types of sensory receptors?
Exteroreceptors - respond to stimuli from outside body
Interoreceptors - respond to stimuli inside body
Proprioreceptors - respond to stimuli which detect body movement
Based on structural complexity, what are the types of sensory receptors?
Simple (includes encapsulated and encapsulated)
Complex
What are the three levels of motor integration?
Recommend level (highest)
Projection level (middle)
Segmental level (lowest)
Somatic Motor Neuron. Number of neurons? Neurotransmitter/s? Excitatory or inhibitory? Effector organs? Myelination?
1 neuron (one synapse)
Acetylcholine - excitatory
Skeletal muscle
Heavily myelinated
Parasympathetic Autonomic Neuron Number of neurons? Neurotransmitter/s? Excitatory or inhibitory? Effector organs? Myelination?
2 neurons (two synapses)
Acetylcholine - inhibitory
Smooth muscle, glands, cardiac muscle
Unmyelinated (post) - lightly myelinated (pre)
Sympathetic Autonomic Neuron Number of neurons? Neurotransmitter/s? Excitatory or inhibitory? Effector organs? Myelination?
2 neurons (two synapses)
Norepinephrine - excitatory
Smooth muscle, glands, cardiac muscle
Unmyelinated (post) - lightly myelinated (pre)
What does the adrenal medulla release? In response to what neurotransmitter?
Releases epinephrine and norepinephrine in response to acetyhcoline
How can the sympathetic and parasympathetic ANS be differentiated anatomically?
Site of origin
- S: thoracolumbar
- P: craniosacral
Relative length of fibres
- S: pre is short, post is long
- P: pre is long, post is short
Location of ganglia
- S: further from organs
- P: close to organs
How man sympathetic ganglion are in the synpathethic trunk?
23 ganglion
ACh is released by:
cholingergic fibres
NE is released by:
adrenergic fibres
