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The Nervous System. Welcome to…. Text, p.241. Nervous System. Central Nervous System. Peripheral Nervous System. Somatic Nerves. Autonomic Nerves. Spinal Cord. Brain. Sensory. Motor. Sympathetic. Parasympathetic. Forebrain. Midbrain. Hindbrain. The Four Lobes…. Cerebrum.

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Welcome to

The Nervous System

Welcome to…


Welcome to

Text, p.241

Nervous System

Central Nervous System

Peripheral Nervous System

Somatic Nerves

Autonomic Nerves

Spinal Cord

Brain

Sensory

Motor

Sympathetic

Parasympathetic

Forebrain

Midbrain

Hindbrain

The Four Lobes…

Cerebrum

Olfactory Lobes

Thalamus

Pons

Medulla Oblongata

Corpus Callosum

Cerebellum

Hypothalamus


Cns pns

CNS & PNS

  • CNS – coordinating centre for information coming in and going out (brain and spinal cord)

  • PNS – carries information between organs of the body and the CNS

http://diabetes.niddk.nih.gov/dm/pubs/complications_nerves/index.htm


First the peripheral nervous system

First, the Peripheral Nervous System…


Somatic nerves voluntary

Somatic Nerves voluntary

  • Control muscles that are connected to the skeleton and skin

  • Sensory nerves

    • Relay information about the environment

  • Motor nerves

    • Initiate an appropriate response

Think of a pin pricking your finger…


Autonomic nerves involuntary

Autonomic Nerves involuntary

  • Special nerves to control the internal organs of the body

  • Sympathetic

    • “on” switch to prepare for stress

  • Parasympathetic

    • “off” switch to return to normal resting levels

What do lie detector tests and erectile dysfunction have in common??


Welcome to

Text, p.241

Nervous System

Central Nervous System

Peripheral Nervous System

Somatic Nerves

Autonomic Nerves

Spinal Cord

Brain

Sensory

Motor

Sympathetic

Parasympathetic


And now the central nervous system

And now, the Central Nervous System…


Spinal cord

Spinal Cord

  • Carries sensory nerve messages from receptors to the brain

  • Relays motor nerve messages from the brain to muscles and glands

  • Like the brain, it is made up of grey and white matter

http://www.accessexcellence.org/RC/AB/IWT/superman/cutawaycord.html


Welcome to

Text, p.241

Nervous System

Central Nervous System

Peripheral Nervous System

Somatic Nerves

Autonomic Nerves

Spinal Cord

Brain

Sensory

Motor

Sympathetic

Parasympathetic


The brain

THE BRAIN

http://www.simpsonstrivia.com.ar/wallpapers/homer-simpson-wallpaper-brain.htm


Oops that s better

Oops! That’s better…

http://www.bbc.co.uk/science/hottopics/intelligence/


The brain1

The Brain

  • Meninges – protective membranes that surround the brain inside the skull

    • dura mater – outer membrane (“tough mother”)

    • arachnoidmater – middle layer (spiderweb-like)

    • pia mater – inner layer (“tender mother”)

p. 257


The brain2

The Brain

  • Major user of glucose (can’t use any other source of energy)

So, how does this make you feel about the “no-carb” craze??

How does glucose enter the body???


Regions of the brain

Regions of the brain

  • Forebrain

    • Contains olfactory lobes, cerebrum & corpus callosum

  • Midbrain

    • Less developed; four spheres of grey matter; relay centre for some eye and ear reflexes

  • Hindbrain

    • Behind midbrain, joins the spinal cord

    • Cerebellum, pons, medulla oblongata


Welcome to

http://web.lemoyne.edu/~hevern/psy340/lectures/psy340.04.2.ns.structure.html


Forebrain

Forebrain

  • Olfactory lobes (2) – smell

  • Cerebrum

    • 2 giant hemispheres; major coordination centres of sensory info & motor reaction

    • Speech, reasoning, memory & personality

  • Cerebral cortex

    • The surface of the cerebrum

    • Composed of grey matter with many fissures


Forebrain continued

Forebrain continued

  • Corpus callosum

    • A bundle of nerves that connects the 2 hemispheres

  • Hemispheres are divided into lobes

    • Frontal lobe

    • Temporal lobe

    • Parietal lobe

    • Occipital lobe


Lobes of the cerebrum

Lobes of the Cerebrum

http://faculty.washington.edu/chudler/lobe.html

Page 260 in your text lists the functions of the lobes


Forebrain or midbrain

Forebrain or Midbrain

  • Thalamus

    • Below the cerebrum

    • Coordinates and interprets

      sensory info

  • Hypothalamus (below)

    • Connected to pituitary

    • Connects the nervous and

      endocrinal systems

http://web.lemoyne.edu/~hevern/psy340/lectures/psy340.04.2.ns.structure.html


Welcome to

Text, p.241

Nervous System

Central Nervous System

Peripheral Nervous System

Somatic Nerves

Autonomic Nerves

Spinal Cord

Brain

Sensory

Motor

Sympathetic

Parasympathetic

Forebrain

Midbrain

Hindbrain

The Four Lobes…

Cerebrum

Olfactory Lobes

Thalamus

Pons

Medulla Oblongata

Corpus Callosum

Cerebellum

Hypothalamus


Hindbrain

Hindbrain

  • Cerebellum

    • Controls limbs, balance,

      muscle tone

  • Pons (“bridge”)

    • Relay station between the 2 parts of the cerebellum and between the cerebellum and the medulla

  • Medulla Oblongata

    • Connector between spine and brain; regulates involuntary muscles

http://web.lemoyne.edu/~hevern/psy340/lectures/psy340.04.2.ns.structure.html


Page 259 in the text

Page 259 in the text

  • Look at the differences in brains of different organisms

  • Cerebellum – muscle tone, movements

  • Forebrain – reason, intellect, memory, language, personality

  • Medulla oblongata – autonomic nerve control


Sheep brain

Sheep Brain…

http://www.gwc.maricopa.edu/class/bio201/brain/brshpx.htm

…see you tomorrow! 


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