Peripheral Nervous System

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Sensory DivisionCranial Nerves

Openings in the skull

Spinal NervesStimulate the rest of the body

Sensory division of peripheral nervous system transmits impulses from sense organs to the central nervous systemCan be categorized by what type of stimulus they respond to…

Sensory ReceptorsType Responds To LocationsChemoreceptor Chemicals Mouth, nose, blood

vesselsPhotoreceptor Light EyesMechanoreceptors Touch, pressure,

vibrations, and stretch

Skin, hair, ears, ligaments, tendons

Thermoreceptors Temperature Changes

Skin, hypothalamus

Pain Receptors Tissue Injury Throughout the body

Peripheral Nervous System

Stimulus Sensory Receptors

Sensory Neurons

Central Nervous System

Cranial NervesStimulate regions of the brain12 Cranial Nerves

OlfactoryOpticOculomotorTrochlearTrigeminalAbducensFacialAuditoryGlossopharyngealVagusAccessoryHypoglossal

Cranial NervesOlfactory – Smell, identify familiar scentsOptic – Snellen Test, pen light testOculomotor – Raise and lower eyelidsTrochlear – “Follow the finger” closer to faceTrigeminal – Sensation on forehead and cheekAbducens – “Follow finger” in all directions

Cranial NerveFacial Nerve – Smile, frown, raise eyebrow, puff cheeksVestibulocochlear – Snap/rub fingers in their earsGlossopharyngeal – Stick out tongueVagus – Ability to speak and swallowAccessory – Turn head left and right and against resistanceHypoglossal – Stick out tongue and move tongue side to side

Cranial NervesNum

Name Type Function

I Olfactory Sensory SmellII Optic Sensory VisionIII Oculomotor Motor Elevation of eyelidIV Trochlear Motor Upward Eye rollingV Trigeminal Mixed Chewing, face sensationVI Abducens Motor Lateral eye movementVII Facial Mixed Taste, smile, frownVIII Vestibulochochl

earSensory Balance, hearing

IX Glossopharyngeal

Mixed Pharyngeal muscle, taste

X Vagus Mixed Gag reflexXI Accessory Motor SCM muscleXII Hypoglossal Motor Tongue Movement

Motor ReceptorsMotor Division of PNS transmits impulses from CNS to muscles or glandsWhat is the chain of how a motor neuron responds to a stimulus?

PNS Cycle

StimulusSensory receptor

sSensory neuron

Interneuron in Spinal cord

Motor Neuron

Autonomic Nervous System

Regulates involuntary activitiesWhen you run, the ANS speeds up heart rate, increases stimulation of sweat glands and slows down the digestive tract

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