Functional Division of Nervous System
The peripheral nervous system (PNS) includes the autonomic and somatic divisions, with the sympathetic system triggering fight-or-flight responses and the parasympathetic system promoting relaxation and maintenance. The sympathetic system involves thoracolumbar components, while the parasympathetic system is craniosacral. Understanding these divisions helps in comprehending the body's automatic functions and responses.
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Presentation Transcript
Department of human Anatomy Functional Division of Nervous System Objectives : Explain the division of peripheral Nervous system (NS) or (PNS) with the function of each division Define the Sympathetic system with its component Define the parasympathetic system with its component Dr. Ahmed Almusawi
Functional divisions of the ns NS AUTONOMIC SOMATIC (Sympathetic & Parasympathetic) Efferent Afferent Efferent Afferent (Motor) skeletal muscles Sensory smooth muscles, heart, glands (Visceral sensation) (General & Special)
The autonomic nervous system Sympathetic : fight or flight ..Danger/ Stress Parasympathetic: relax and maintain
The fight or flight response vs Relaxation / maintenance
Sympathetic = Thoracolumbar [T1-L2 (L3)] Sympathetic trunk All Spinal nerves CN IX, X, XII Organs Short pregagnglionic Long postganglionic Parasympathetic = Craniosacral [CN III, VII, IX, X + S2, S3, S4] Ganglia Organs Long pregagnglionic Short postganglionic
