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Nervous System Objectives: 1.Identify structures of the nervous system. 2.Explain differences in the function of the peripheral nervous system and the central nervous system.

Nervous System

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Nervous System. Objectives: Identify structures of the nervous system. Explain differences in the function of the peripheral nervous system and the central nervous system. D. Nervous Tissue. Nervous tissue is found in the brain, spinal cord, and nerves. made up of: - PowerPoint PPT Presentation

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Page 1: Nervous System

Nervous System

Objectives:1.Identify structures of the nervous

system.2.Explain differences in the function of the peripheral nervous system and the

central nervous system.

Page 2: Nervous System

D. Nervous Tissue• Nervous tissue is

– found in the brain, spinal cord, and nerves. – made up of:

1. Neurons: nerve cells (bundles of axons)2. Neuroglial cells: helper cells

– “glia” = glue– Support and bind components of nervous tissue to

each other and to blood vessels– Function similarly to connective tissue in other

organ systems

Page 3: Nervous System

Parts of a Neuron• Sketch neuron and label parts.

Page 4: Nervous System

Nervous System• Organs of this system are divided into 2

groups:1. Central Nervous System (CNS)

• Brain• Spinal cord

2. Peripheral Nervous System (PNS)• Composed of the nerves (peripheral nerves)

that connect the CNS to other body parts• Functions of the nervous system:

1. Sensory2. Integrative3. Motor

Page 5: Nervous System

1. Sensory Function• Sensory receptors at the ends of

peripheral neurons:– Gather info by detecting changes inside and

outside the body.• Inside: temperature and oxygen concentration• Outside: light and sound intensities

– Convert info into nerve impulses (electrochemical changes) which are transmitted along peripheral nerves to the CNS

Page 6: Nervous System

2. Integrative Function• Nerve impulses are integrated (brought

together) in the CNS.• Allows us to make conscious or

subconscious decisions.

Page 7: Nervous System

3. Motor Function• Peripheral nerves carry impulses from

the CNS to effectors (responsive structures).

• Effectors are NOT part of the nervous system, but include muscles and glands.

Page 8: Nervous System

Motor Function• Motor functions can be divided into 2

groups:– Somatic nervous system

• Consciously controlled (voluntary)• Controls skeletal muscle

– Autonomic nervous system:• Involuntary• Includes heart, smooth muscle, and various

glands

Page 9: Nervous System

Nervous System Function Recap

1. Detects changes inside and outside the body,

2. Makes decisions based on the information received, and

3. Stimulates muscles or glands to respond.

• What is the purpose of this process?????

Page 10: Nervous System

Neuroglial Cells• Functions:

– Fill spaces– Provide structural frameworks– Produce myelin– Carry on phagocytosis

• Vary from CNS to PNS• Table: Type of Cell, Location, Function,

Other specific info