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Chapter 11 - Nervous System

Terms in this set (41)

What are the functions of the Nervous System?
1. Sensory Input
2. Integration
3. Motor Output
What are the 2 Divisions of the NS?
1. Central nervous system (CNS)
-Brain and spinal cord
-Integration and command center
2. Peripheral nervous system (PNS)
-Paired spinal and cranial nerves carry messages to and from the CNS
Peripheral Nervous System breaks down into what 2 functional groups?
1. Sensory (afferent) Division
2. Motor (efferent) Division
Sensory (Afferent) Division of PNS controls what?
1. Somatic afferent fibers—convey impulses from skin, skeletal muscles, and joints
2. Visceral afferent fibers—convey impulses from visceral organs
Motor (Efferent) Division of PNS controls what?
Transmits impulses from the CNS to effector organs
Motor Division of PNS breaks down into what 2 types?
1. Somatic (voluntary) nervous system
2. Autonomic (involuntary) nervous system (ANS)
What is the Somatic nervous system in PNS?
Conscious control of skeletal muscles
What is the Autonomic nervous system in PNS?
Visceral motor nerve fibers - regulates smooth muscle, cardiac muscle, and glands
--Two functional subdivisions
-----Sympathetic
-----Parasympathetic
What does the Sympathetic NS do?
Mobilizes body systems during activity
What does the Parasympathetic do?
Conserves energy and promotes house keeping functions during rest.
What is the order of the nervous system? (breakdown)
What are the two types of nervous cells?
1. Neurons
2. Neuroglia
Astrocytes are what? Do what?
Most abundant, versatile, and highly branched glial cells
What do Astrocytes do?
1. Cling to neurons, synaptic endings, and capillaries
2. Support and brace neurons
What are Microglia?
-Small, ovoid cells with thorny processes
-Migrate toward injured neurons
-Phagocytize microorganisms and neuronal debris
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