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Your Nervous System. Peripheral Nervous System. Engage. As a class visit IQ Test Labs at www.intelligencetest.com/reflex/index.htm

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your nervous system

Your Nervous System

Peripheral Nervous System

engage
Engage
  • As a class visit IQ Test Labs at www.intelligencetest.com/reflex/index.htm
  • Select various students to come to the computer and test their skills on the different reflex/reaction tests. This website states that scientific tests have shown that reaction times to simple tasks have high correlations with g the general intelligence factor. Students should have fun attempting these reaction time games.
explore
Explore
  • Muscle Messages
slide4

Central nervous system

Peripheral nervous system

Sensory nerves

Motor nerves

Somatic nervous system

Autonomic nervous system

Parasympathetic nervous system

Sympathetic nervous system

Explain

Section 35-3

The Nervous System

is divided into

which consists of

that make up

which is divided into

slide5
PNS
  • NERVES that connect the central nervous system to the rest of the body
  • Motor Division – impulses from CNS to muscles or glands
      • Two Parts:
        • Somatic Nervous System
        • Autonomic Nervous System
  • Sensory Division – transmits impulses from sense organs to CNS
somatic nervous system
Somatic Nervous System
  • Controls voluntary movement of the skeletal muscles
autonomic nervous system
Autonomic Nervous System
  • Controls involuntary actions
    • Subdivided into two system that have opposite effects on the same organs:
      • Parasympathetic – decreases heart rate
        • Controls internal organs during normal activity
      • Sympathetic – increases heart rate
        • Controls internal organs during high stress activity
1 pain receptors
1. Pain Receptors
  • Throughout body; except brain
  • Respond to chemical released by damaged cells
  • Important to recognize
    • Danger
    • Injury
    • Disease
2 thermoreceptors
2. Thermoreceptors
  • In skin, body core, hypothalamus
  • Detect variations in body temperature
3 mechanoreceptors
3. Mechanoreceptors
  • Skin, skeletal muscle, and inner ears
  • Sensitive to
    • Touch
    • Pressure
    • Stretching of muscles
    • Sound
    • motion
4 chemoreceptors
4. Chemoreceptors
  • Nose and Tongue
    • Chemical in external environment
slide15

Vitreous humor

Muscle

Lens

Fovea

Aqueous humor

Cornea

Pupil

Optic nerve

Iris

Blood vessels

Ligaments

Retina

Choroid

Sclera

Figure 35-14 The Eye

Section 35-4

5 photoreceptors
5. Photoreceptors
  • Eyes
  • Sensitive to Light
  • DO NOT WRITE NEXT INFO – IT IS ON YOUR SHEET
vision
Vision
  • Cornea
    • Helps focus light
    • Filled with aqueous humor
  • Iris
    • Back of cornea
    • Colored part of eye
  • Pupil
    • Tiny muscles regulate the size
    • Regulates amount of light
  • Lens
    • Small muscles change its shape to focus on object near and far away
    • Behind lens eye filled with vitreous humor
  • Retina
    • Has photoreceptors
    • No photoreceptors where optic nerve passes through the back of the eye; blind spot
    • Two types
      • Rods – black and white
      • Cones – color
pathway for vision reception
Pathway for Vision Reception
  • Light
  • cornea
  • iris and pupil
  • lens
  • Retina to photoreceptors
    • Rods
    • Cones – Fovea
  • Optic Nerve
  • Brain
slide19

Oval window

Stirrup

Anvil

Semicircular canals

Hammer

Cochlear nerve

Cochlea

Bone

Auditory canal

Tympanum

Round window

Eustachian tube

Figure 35-15 The Ear

Section 35-4

hearing and balance
Hearing and Balance
  • Ear
  • Two Functions
    • Hearing
    • Detecting Positional change to movement
hearing
Hearing
  • Sound – air vibrations
  • Auditory canal – funnels air to tympanum (ear drum)
  • Tymapnum – vibrates
  • Hammer, Anvil, Stirrup- vibrate and transmit vibrations to oval window
  • Cochlea – filled with fluid and vibrations create pressure waves in the inner ear
  • Tiny hairs respond to waves and send messages to brain via the cochlear nerve
balance
Balance
  • Semicircular Canals
    • 3 canals that form half circles
    • Filled with fluid and hairs that detect motion of head in relation to gravity
slide23

Oval window

Stirrup

Anvil

Semicircular canals

Hammer

Cochlear nerve

Cochlea

Bone

Auditory canal

Tympanum

Round window

Eustachian tube

Figure 35-15 The Ear

Section 35-4

smell and taste
Smell and Taste
  • Chemoreceptors pick up chemical reception in nose and mouth
  • Smell – olfactory bulb
  • Taste – taste buds
    • Salty
    • Bitter
    • Sour
    • Sweet
slide25

Olfactory

(smell) bulb

Taste

sensory area

Olfactory

nerve

Thalamus

Cerebral cortex

Smell receptor

Nasal cavity

Smell

sensory area

Taste bud

Taste pore

Taste receptor

Sensory

nerve fibers

The Senses of Smell and Taste

Section 35-4

touch and related senses
Touch and Related Senses
  • Largest sense organ?
    • SKIN
  • Sensory Receptors
    • Temperature
    • Touch
    • Pain
  • Greatest density of touch receptors
    • Fingers
    • Toes
    • Face
slide27

Central nervous system

Peripheral nervous system

Sensory nerves

Motor nerves

Somatic nervous system

Autonomic nervous system

Parasympathetic nervous system

Sympathetic nervous system

Concept Map

Section 35-3

The Nervous System

is divided into

which consists of

that make up

which is divided into

elaborate
Elaborate
  • Reflex Arc Lab