CNS (central nervous system)
Located within the skull (brain) and spine (spinal chord)
PNS (peripheral nervous system)
Located outside the skull and spine
CNS: PNS:
• Brain and spinal chord • Peripheral nerves
• Integrative control I (cranial and spinal)
centre • Communication
between CNS and
body
Sensory (A erent) Division:
1 I
Motor (E erent)
• Composed of sensory Division: Motor nerves send
impulses from CNS
neurons • Composed of motor to e ectors and
• Conducts signals from neurons organs
receptors to CNS • Conducts signals from
CNS to e ectors
d
carry sensory Automatic Nervous
a t
Somatic Nervous
information from
receptors in the PNS
System: System:
(skin, skeletal muscles, • Controls involuntary • Controls
Regulates the responses Interacts with
glands and organs) to voluntary the external
the central nervous internal
system. environment movement environment
I t
Sympathetic Division: Parasympathetic nervesarelocatedin to
• Mobilises body systems Division: the12cranialnerves
• ‘Flight or ght’ • Conserves energy maintain'sHomeostasis
responses • ‘Rest and digest’
responses
Noradrenalineactivatesthisacute
dangeror
responseincaseof
imminent
Sympathetic nerves
Parasympathetic nerves ‘Fight or ight’
I
‘Rest and digest’
• Dilate pupils
• Inhibit saliva
• Constrict pupils
• Increase heartbeat
• Stimulate saliva
• Relax airways
• Slow heartbeat
• Inhibit activity of
• Constrict airways
stomach
• Stimulate activity of stomach
• Stimulate release of
• Inhibit release of glucose;
glucose; inhibit
stimulate gallbladder
gallbladder
• Stimulate activity of intestines
• Inhibit activity of
intestines
• Secrete epinephrine
fieriness
and norepinephrine increases arousal
• Relax bladder and time
reaction
• Promote ejaculation
I
and vaginal
contraction
ff ff
fl
ff
fi
, Neurons- Overveiw
Neurons are nerve cells, special aimed for communication.
Information is transmitted electrically, within a neuron chemically, through synapses
between neurons.
Neurons connect to each other to form neural networks.
All neurons have a similar basic structure
I
Neurons- Types
Motor Neurons
Communicate from the CNS to the muscle (organism intends to move)
Sensory Neurons
Carry sensory information from the body and outside world to the CNS. (Generally
very long cells)
Interneurons
Neurons that transmit information between motor and sensory neurons in the CNS
Located within the skull (brain) and spine (spinal chord)
PNS (peripheral nervous system)
Located outside the skull and spine
CNS: PNS:
• Brain and spinal chord • Peripheral nerves
• Integrative control I (cranial and spinal)
centre • Communication
between CNS and
body
Sensory (A erent) Division:
1 I
Motor (E erent)
• Composed of sensory Division: Motor nerves send
impulses from CNS
neurons • Composed of motor to e ectors and
• Conducts signals from neurons organs
receptors to CNS • Conducts signals from
CNS to e ectors
d
carry sensory Automatic Nervous
a t
Somatic Nervous
information from
receptors in the PNS
System: System:
(skin, skeletal muscles, • Controls involuntary • Controls
Regulates the responses Interacts with
glands and organs) to voluntary the external
the central nervous internal
system. environment movement environment
I t
Sympathetic Division: Parasympathetic nervesarelocatedin to
• Mobilises body systems Division: the12cranialnerves
• ‘Flight or ght’ • Conserves energy maintain'sHomeostasis
responses • ‘Rest and digest’
responses
Noradrenalineactivatesthisacute
dangeror
responseincaseof
imminent
Sympathetic nerves
Parasympathetic nerves ‘Fight or ight’
I
‘Rest and digest’
• Dilate pupils
• Inhibit saliva
• Constrict pupils
• Increase heartbeat
• Stimulate saliva
• Relax airways
• Slow heartbeat
• Inhibit activity of
• Constrict airways
stomach
• Stimulate activity of stomach
• Stimulate release of
• Inhibit release of glucose;
glucose; inhibit
stimulate gallbladder
gallbladder
• Stimulate activity of intestines
• Inhibit activity of
intestines
• Secrete epinephrine
fieriness
and norepinephrine increases arousal
• Relax bladder and time
reaction
• Promote ejaculation
I
and vaginal
contraction
ff ff
fl
ff
fi
, Neurons- Overveiw
Neurons are nerve cells, special aimed for communication.
Information is transmitted electrically, within a neuron chemically, through synapses
between neurons.
Neurons connect to each other to form neural networks.
All neurons have a similar basic structure
I
Neurons- Types
Motor Neurons
Communicate from the CNS to the muscle (organism intends to move)
Sensory Neurons
Carry sensory information from the body and outside world to the CNS. (Generally
very long cells)
Interneurons
Neurons that transmit information between motor and sensory neurons in the CNS
