The Nervous System (Peripheral Nervous System).  Peripheral nervous System (PNS): all the parts of the nervous system except for the brain & spinal cord.

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Presentation transcript:

The Nervous System (Peripheral Nervous System)

 Peripheral nervous System (PNS): all the parts of the nervous system except for the brain & spinal cord Peripheral Nervous system

 Peripheral nervous System (PNS): all the parts of the nervous system except for the brain & spinal cord  Connects all parts of the body to the brain & spinal cord Peripheral Nervous system

 Peripheral nervous System (PNS): all the parts of the nervous system except for the brain & spinal cord  Connects all parts of the body to the brain & spinal cord  Nerves: carry information Peripheral Nervous system

 Neuron: nerve cell that transfers electrical messages called impulses Peripheral Nervous system

 Neuron Structure-  Cell body (nucleus & organelles) Peripheral Nervous system

 Neuron Structure-  Cell body (nucleus & organelles)  Dendrites: short branches that receive messages Peripheral Nervous system

 Neuron Structure-  Cell body (nucleus & organelles)  Dendrites: short branches that receive messages  Axons: elongated extensions that carry the message away Peripheral Nervous system

 Neuron Structure-  Cell body (nucleus & organelles)  Dendrites: short branches that receive messages  Axons: elongated extensions that carry the message away  Axon Terminal: tip of the axon Peripheral Nervous system

2 types of neurons:  sensory:  Gather information  Receptors detect changes in/out body  heat receptors; light receptors Peripheral Nervous system

2 types of neurons:  motor:  Send impulses from brain/ spinal cord to body  Respond to impulses sent by sensory neurons Peripheral Nervous system

2 types of neurons:  example:  Heat receptors in hand feel the hot stove & send impulses to brain (sensory)  Motor neurons respond by sending impulses to arm muscles to remove hand from stove Peripheral Nervous system

Nerve: a collection of axons bundled together with blood vessels & connective tissue Peripheral Nervous system

Nerve: a collection of axons bundled together with blood vessels & connective tissue - connects the body to the brain and spinal cord Peripheral Nervous system

Nerve: a collection of axons bundled together with blood vessels & connective tissue - connects the body to the brain and spinal cord - contains both motor and sensory axons Peripheral Nervous system

 Motor part of the PNS has two parts:  Somatic- under your control; voluntary; skeletal muscles Peripheral Nervous system

 Motor part of the PNS has two parts:  Somatic- under your control; voluntary; skeletal muscles  Autonomic- controls functions that you do not think about; digestion Peripheral Nervous system