PNS Flashcards
what are the sensory receptors of the PNS?
specialized cells that detect things like T, pain, touch, pressure, light, sounds, odors etc
what are the components of the PNS?
sensory receptors
nerves
ganglion
what is a nerve in the PNS
a bundle of axons and their sheaths that connect the CNS to sensory receptors, muscles and glands
how many pairs of cranial nerves? spinal nerves? where do they originate
12 pr, brain
31 pr, spinal cord
what is a ganglion?
collection of neuron cell bodies outside the CNS
what are the 2 divisions of the PNS
sensory (or afferent)
motor (or efferent
what is a collection of neuron cell bodies outside the CNS called?
ganglion
what are specialized cells that detect T, pain, touch, pressure, light, sound, odors?
sensory receptors
what is a bundle of axons and their sheaths?
nerve
what connects the CNS to sensory receptors, muscles and glands
nerves
what direction does the sensory division of PNS travel?
from sensory receptor to CNS
what direction does the AP travel in a motor neuron?
from CNS to effectors (muscle, glands)
what subdivision of the PNS transmits AP from receptors to CNS?
sensory or afferent
what subdivision of the PNS transmits AP from CNS to effector cell?
motor or efferent
what are the subdivisions of the motor division of PNS?
somatic NS
autonomic NS
describe the motor division of the PNS
from CNS to skeletal muscles
voluntary
single neuron system
neuromuscular junction is a synapse between neuron and skeletal muscle cell
describe the autonomic subdivision of the motor division of the PNS
from CNS to smooth muscle, cardiac muscle, certain glands
involuntary
from CNS to ganglion, from ganglion to effector (2 neuron system)
further subdivided (sympathetic, parasympathetic, enteric)
which division of the PNS is voluntary
somatic motor nervous system
what are the subdivisions of the autonomic motor nervous system?
parasympathetic, sympathetic, enteric
which division of the motor PNS is a single neuron system? double?
somatic
autonomic
compare and contrast the autonomic nervous system and the somatic nervous system
both connect CNS to something periphery
somatic is voluntary, autonomic is involuntary
somatic is one nerve, autonomic is two nerves (synapse at ganlion)
somatic synapse with skeletal muscles, autonomic synapse with smooth muscle, certain glands
autonomic nervous system ifs further divided, somatic is not
compare and contrast the control of the motor divisions of the PNS
somatic = voluntary autonomic = involuntary
define sympathetic subdivision of autonomic nervous system
prepares body for physical activity (fight or flight)
define parasympathetic ANS
regulates resting or vegetative fn that are not critical for survival:
digesting food
emptying bladder
define enteric ANS
with the wall of the digestive tract
which division of the NS regulates fns not critical to survival?
parasympathetic
which division of the NS regulates emptying of the urinary bladder
parasympathetic
