Nervous system - created from Mind Map

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Central Nervous system (CNS)<br><br><ul><li>-Brain and spinal cord

-Responsible for integrating, processing, coordinating sensory and motor commands</li></ul>

Peripheral Nervous system (PNS)<br><br><ul><li>-All neural tissue outside the CNS</li></ul>

Brain

Spinal cord

Sensory division<br><br><ul><li>-Bring infor to CNS</li></ul>

Motor Division<br><br><ul><li>-carries motor commands from the CNS to other areas.</li></ul>

Somatic sensory receptors<br><br><ul><li>-position

-touch

-pressure

-pain

-temperature</li></ul>

Special sensory receptors<br><br><ul><li>-smell

-taste

-vision

-balance

-hearing</li></ul>

Visceral Sensory receptors<br><br><ul><li>-Monitor internal organs</li></ul>

Autonomic nervous system (ANS)<br><br><ul><li>-Smooth muscle

-cardiac muscle

-glands

-adipose tissue

-control visceral function outside our awareness

-integrative centers located in the hypothala

-motor neuron carry info from hypothala to autonomic centers

-comparable to upper motor neurons in SNS.</li></ul>

Somatic nervous system (SNS)<br><br><ul><li>-Skeletal muscle</li></ul>

Preganglionic nerons<br><br><ul><li>-cell bodies lie in the brain stem and spinal cord

-part of visceral reflex arcs

-most activites represent direct reflex responses

-leave CNS and synapse with ganglionic neuron</li></ul>

Ganglionic neurons<br><br><ul><li>-cell bodies in the peripheral autonomic ganglia

-contain hundreds to thousands of ganglionic neurons

-innervate visceral effectors

-cardiac muscle, smooth muscle, glands, adipose tissue</li></ul>

Sympathetic Division<br><br><ul><li>-active when stress, emergency or exertion

-Thoracolumbar division

-axon innerve ganglia close to spinal cord</li></ul>

Parasympathetic division<br><br><ul><li>-predom under resting condi

-craniosacral division

-axon innerve ganglia lose to target organs</li></ul>

Enteric Division<br><br><ul><li>-Extensive network of neurons and nerve networks located in walls of the digestive tract

-influenced by sympathetic and parasympathetic

-use same NT found in brain</li></ul>

Terminal ganglia

Intramural ganglia

Upper motor neuron

Lower motor neuron<br><br><ul><li>Control by:

-Reflexes based in the spinal cord or brain

-upper motor neurons</li></ul>

Corticospinal pathway<br><br><ul><li>-provide voluntary control over skeletal muscles

-sometimes call the pyramidal system

-upper motor neurons begin in the primary motor control

-upper axon descend into brain stem and spinal cord</li></ul>

Corticobulbar tracts

Corticospinal tracts