Download 2222222222222222222 System • Responsible for coordinating the

_________________ System
Co-ordinates all incoming and out coming
information
=______________________________
Brain
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___________________ System
Responsible for coordinating the actions of the body
All animals have a nervous system
Humans have a dorsally located ___________________(vertebrae)
Anterior end of the nerve cord is ______________________ and is
dominant controller of the whole nervous system
Spinal Cord
___________________ Nervous System
Communicates between the CNS and the rest of the body
_________________ Nervous System
• Nerves which control internal organs
=____________________
• Further divided into sympathetic and
parasympathetic systems
= _____________________
• Damage to your CNS often results in
reduced function or movement, while
______________ to parts of the PNS
often results in death
________ Nervous System
Contains nerves of the skin,
skeletal muscle and bone
=___________________
_________ neurons- sends information from the CNS
to the muscle cells or the glands
__________ Neurons- Nerve cells transmits
information about the internal and external
environment changes to the CNS
Neurons
• Neurons are the _______________ of all nervous systems.
• Most nerves are composed of many ______________
• Transmit impulses ____________ from neuron to neuron.
• These messages are a thousandths of a second long.
Neuron Structure
• Although neurons differ in size and function, all are
composed of similar parts:
o Cell body: area of the nerve containing the nucleus
o Dendrites: made of cytoplasm
! ________________________________
__________________
o Axon: cytoplasmic tail that carries the nerve impulse
to other nerves or effectors
o Myelin sheath: fatty covering along the axon of a
nerve and of Schwann cells
! ____________________________
____________________
o Neurilemma: thin membrane ____________
_____________ of the peripheral nervous system
which promotes the repair of damaged axons
• Variations of this general structures result from
specialization of neurons for different function
Elements of the nervous system
• ______________
o Any organ that picks up stimulus
o Ex. eye, nose, skin
• Effectors
o Any organ that _________________
o Ex. Muscle gland
• Conductors
o Transmit information about __________
between the receptor and an effector
o Ex. neurons (include those in the brain and spinal
chord)
• Elements of the nervous system
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There are three types of neurons in mammals:
• Sensory
o ____________________________ and passes it to
the control center (CNS)
o Can be up to 1m long
• Associative
o Transmit the impulses _________________ to a
motor neuron or vice versa
o Links sensory neurons and motor neurons
o In control center (CNS)= ________________
__________
o Microscopic in size
• Motor
o Carries ____________ to an effector, such as a
muscle or a gland
o Range in size up to a meter long
These 3 neurons, combined with a receptor, which detects
impulses, and the effector, which acts upon the impulse ________
_____________________