Autonomic Nervous System PDF

Autonomic Nervous System DR. ASAAD AL-SHOUK M.D. PH.D. Objectives: Understanding the ANS. Division of ANS The sympathetic nervous system The parasympathetic nervous system The enteric nervous system System Overview UNDERSTANDING THE AUTONOMIC NERVOUS SYSTEM The autonomic nervous system (ANS...

Autonomic Nervous System DR. ASAAD AL-SHOUK M.D. PH.D. Objectives: Understanding the ANS. Division of ANS The sympathetic nervous system The parasympathetic nervous system The enteric nervous system System Overview UNDERSTANDING THE AUTONOMIC NERVOUS SYSTEM The autonomic nervous system (ANS) regulates involuntary physiological functions, including heart rate, blood pressure, and digestion. It operates unconsciously, influencing many body systems. Main Components SYMPATHETIC NERVOUS SYSTEM PARASYMPATHETIC NERVOUS SYSTEM In contrast, this system promotes This system prepares the body for stressful or 'rest and digest' activities. It emergency situations, often referred to as 'fight or decreases heart rate and enhances flight'. It increases heart rate and redirects blood digestion and relaxation following flow to essential organs. stress. THIRD PART; Differences between sympathetic and parasympathetic NS. Parasympathetic; central & peripheral:   Sympathetic Nervous System: Preganglionic fibers of the sympathetic nervous system arise from nerve cell bodies located in the lateral horn of spinal cord levels T1 to L2,3. The sympathetic preganglionic fibers have one of three possible synaptic alternatives. 1. Coeliac Gangia 2. sup. Mesenteric Ganglia. 3. inferior mesenteric Ganglia 4. Plexus hypogastricus inferior The interrupted lines indicate postganglionic fibres of the autonomic nervous system. In Summery Parasympathetic NS Sympathetic NS  THANK YOU Dr.Asaad AL-SHOUK