Peripheral nervous system Flashcards
what are the 2 primary cell types that comprise nervous tissue?
- Neurons
- Neuroglia
What are the functions of neuroglia?
-Support/provide nutrition for neurons
-Destroy pathogens
-Long-term signaling
A _____ is a bundle of axons/nerve fibers where each fiber is surrounded by glial cells
nerve
what type of innervation do nerves provide?
BOTH afferent and efferent
where do nerves originate?
at CNS boundary
what are the CNS and PNS made of?
CNS- brain and spinal cord
PNS - everything else
a _____ is a collection of neuronal cell bodies in the PNS
ganglion
_____ system takes sensory information from receptors in the PNS to the CNS
Afferent
how many neurons are in the afferent system?
3 neurons (1PNS, 2 CNS)
The ________ system sends the CNS motor commands to muscles and glands
efferent
what are the 2 divisions of the efferent system?
Somatic
Autonomic
The ______ division is for voluntary control and uses the neurotransmitters _____&______
Somatic
glutamate, Ach
how many neurons does the somatic division have?
2 CNS
The ______ division is for involuntary regulation of smooth and cardiac muscle and uses the neurotransmitters _____ & ______
autonomic
Ach and/or (Nor)epi
how many neurons does the autonomic division have?
2- 1PNS & 1CNS
what are the 4 kinds of nerve fibers?
- somatic sensory
- Visceral sensory
- somatic motor
- visceral motor
which of the nerve fibers are afferent? efferent?
AFFERENT: somatic sensory, visceral sensory
EFFERENT: somatic motor, visceral motor
what are the branches of a spinal nerve? (4)
-Spinal cord (CNS)
-Spinal nerve (PNS)
-Dorsal root
-Ventral root
the ______ root only carries sensory information
Dorsal root
The ______ root only carries motor information
ventral
what type of tissues does the somatic nervous system control?
skeletal muscle
what type of tissues does the autonomic nervous system control?
smooth, cardiac muscle, glands
list the 3 components of a relay arc
Sensory neuron → relay neuron → motor
what are the two sections of the PNS?
parasympathetic “rest and digest”
sympathetic “fight or flight”
The parasympathetic PNS has a ______ pre-ganglion, and a _____ post-ganglion (closer to organ)
long, short
The parasympathetic PNS has the neurotransmitter _____ between both pre/post ganglion and post ganglion/organ
acetylcholine
The sympathetic PNS has a _____ pre-ganglion, _____ post-ganglion
short, long
The sympathetic PNS has the neurotransmitter _____ between pre/post ganglions, and ____ between post ganglion/organ
Ach,
Norepinephrine
