Divisions of the Nervous System

Imagemap
Divisions of the Nervous SystemCentral Nervous System (CNS)StructuresBrainSpinal CordIncludes tracts and nucleiPeripheral Nervous System (PNS)StructuresSpinal Nerves31 pairsMixed (Motor and Sensory)Cranial Nerves12 PairsSome are motor, some sensory, some are m ...Sensory ReceptorsGangliaDivisions of PNSSomaticEffectorsSkeletal MusclesNumber of neurons from CNS to Effectors1 neuron - secretes acetylcholine - neur ...VoluntaryAutonomicEffectorsSmooth muscle, cardiac muscle, glandsNumber of neurons from CNS to effectors2 neuronsInvoluntaryDivisions of Autonomic Nervous SystemParasympatheticResponsible for rest and digestPreganglionic neuron secretes acetylchol ...Postganglionic neuron also secretes acet ...Craniosacral outflow, long preganglionic ...SympatheticResponsible for fight or flightPreganglionic neuron secretes acetylchol ...Postganglionic neuron secretes norepinep ...Thoracolumbar outflow, short preganglion ...
hide
Divisions of the Nervous System
hide
Central Nervous System (CNS)
hide
Structures
leaf
Brain
leaf
Spinal Cord
leaf
Includes tracts and nuclei
hide
Peripheral Nervous System (PNS)
hide
Structures
hide
Spinal Nerves
leaf
31 pairs
leaf
Mixed (Motor and Sensory)
hide
Cranial Nerves
leaf
12 Pairs
leaf
Some are motor, some sensory, some are mixed (both motor and sensory
leaf
Sensory Receptors
leaf
Ganglia
hide
Divisions of PNS
hide
Somatic
hide
Effectors
leaf
Skeletal Muscles
hide
Number of neurons from CNS to Effectors
leaf
1 neuron - secretes acetylcholine - neuron is said to be cholinergic
leaf
Voluntary
hide
Autonomic
hide
Effectors
leaf
Smooth muscle, cardiac muscle, glands
hide
Number of neurons from CNS to effectors
leaf
2 neurons
leaf
Involuntary
hide
Divisions of Autonomic Nervous System
hide
Parasympathetic
leaf
Responsible for rest and digest
leaf
Preganglionic neuron secretes acetylcholine as neurotransmitter - neuron is said to be cholinergic
leaf
Postganglionic neuron also secretes acetylcholine as neurotransmitter - neuron is said to be cholinergic
leaf
Craniosacral outflow, long preganglionic neuron, short postganglionic neuron
hide
Sympathetic
leaf
Responsible for fight or flight
leaf
Preganglionic neuron secretes acetylcholine as neurotransmitter - neuron is said to be cholinergic
leaf
Postganglionic neuron secretes norepinephrine (noradrenalin) as neurotransmitter - neuron is said to be adrenergic
leaf
Thoracolumbar outflow, short preganglionic neuron and a long postganglionic neuron