PNS: Spinal and Cranial Nerves
Peripheral Nervous System



Exterior to the CNS
Interacts with CNS
Cranial and Spinal Nerves
Cranial Nerves





12 in total
Named by Roman Numerals and Names
ex: Cranial Nerve V
Primarily serve head/neck region
Except 1 nerve (Vagus) that goes out
Mnemonic Device to remember

On Old Olympus Towering Tops A Friendly
Viking Grew Vines and Hops
Also for Sensory/Motor/Both
 Some Say Marry Money But My Brother
Says Big Brains Matter More
Function Chart

Make yourself a chart in your notes (I- XII)

Nerve name, function, sensory/motor
Function of each
Spinal Nerves


31 total spinal nerves
DORSAL and VENTRAL root converge
external to spinal column
Dorsal


Carries sensory fibers
(afferent)
Carries info TOWARDS
CNS
Ventral


Carries motor fibers
(efferent)
Carries info AWAY from
CNS
1st Break Down: Sensory/Motor
Peripheral Nervous
System
Sensory
(Afferent)
Motor
(Efferent)
Sensory



Pick up info from
environment via
receptors
5 receptors
Classed by stimulus
Motor


Movement induced via
NT
Remember NMJXN and
ACH…
Sensory Receptors

Mechanoreceptors: changes via movement
–




Ex: touch, pressure, stretch, vibration
Thermo: temperature
Photo: Light
Chemo: Chemicals in solution
Nociceptors: PAIN
Secondary Division of MOTOR
Peripheral Nervous
System
Sensory
(Afferent)
Motor
(Efferent)
Somatic
(Voluntary)
Autonomic
(Involuntary)
Somatic Motor


Voluntarily activates muscles (skeletal)
Neuron- cell body in CNS and Axon to
muscle
Autonomic Motor




Regulates smooth & Cardiac muscle
Regulates glands
Maintains stability/homeostasis
Neuron Comm- 2 NEURONS
–
–
–
1st in CNS
2nd in PNS
Connection b/w 2 made in ganglion
3rd Division (of autonomic)
Peripheral Nervous
System
Sensory
(Afferent)
Motor
(Efferent)
Somatic
(Voluntary)
Autonomic
(involuntary)
Parasympathetic
(Rest and Digest)
Sympathetic
(Fight or Flight)
Sympathetic




Division of ANS
Fight/Flight
Antagonist to Para
NT: Norepi and Epi
Parasympathetic




Division of ANS
Rest/Digest
Antagonist to
Sympathetic
NT: ACH
Make this chart
Parasympathetic
Pupils
Saliva
Heart rate
Lung
function
Digestion
Liver
Bladder
Adrenal
glands
NONE
Sympathetic
Mystery Diagnosis


RSD-1
RSD-2