Peripheral Nervous System
Homework
Study for Jeopardy tomorrow!
Sensory Division
Cranial NervesOpenings 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 system
Can be categorized by what type of stimulus they respond to…
Sensory ReceptorsType Responds To Locations
Chemoreceptor Chemicals Mouth, nose, blood vessels
Photoreceptor Light Eyes
Mechanoreceptors 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 brain
12 Cranial NervesOlfactory
Optic
Oculomotor
Trochlear
Trigeminal
Abducens
Facial
Auditory
Glossopharyngeal
Vagus
Accessory
Hypoglossal
Cranial Nerves
Olfactory – Smell, identify familiar scents
Optic – Snellen Test, pen light test
Oculomotor – Raise and lower eyelids
Trochlear – “Follow the finger” closer to face
Trigeminal – Sensation on forehead and cheek
Abducens – “Follow finger” in all directions
Cranial Nerve
Facial Nerve – Smile, frown, raise eyebrow, puff cheeks
Vestibulocochlear – Snap/rub fingers in their ears
Glossopharyngeal – Stick out tongue
Vagus – Ability to speak and swallow
Accessory – Turn head left and right and against resistance
Hypoglossal – Stick out tongue and move tongue side to side
Cranial NervesNum
Name Type Function
I Olfactory Sensory Smell
II Optic Sensory Vision
III Oculomotor Motor Elevation of eyelid
IV Trochlear Motor Upward Eye rolling
V Trigeminal Mixed Chewing, face sensation
VI Abducens Motor Lateral eye movement
VII Facial Mixed Taste, smile, frown
VIII Vestibulochochlear
Sensory Balance, hearing
IX Glossopharyngeal
Mixed Pharyngeal muscle, taste
X Vagus Mixed Gag reflex
XI Accessory Motor SCM muscle
XII Hypoglossal Motor Tongue Movement
Motor Receptors
Motor Division of PNS transmits impulses from CNS to muscles or glands
What is the chain of how a motor neuron responds to a stimulus?
PNS Cycle
Stimulus Sensory receptors
Sensory neuron
Interneuron in Spinal cord
Motor Neuron
Autonomic Nervous System
Regulates involuntary activities
When you run, the ANS speeds up heart rate, increases stimulation of sweat glands and slows down the digestive tract
Homework
Study for Jeopardy tomorrow!