Autonomic Nervous System 5 Lecture PDF
Document Details
King Salman International University
2024
Mohamed Talal
Tags
Summary
This document is a lecture on the autonomic nervous system, covering its effects on various parts of the body, including the heart, lungs, gastrointestinal tract, and urinary bladder. It also details the neurotransmitters and receptors involved in the system's function. The lecture likely forms part of a medical course.
Full Transcript
Field of Medicine Medicine Program Lecture : (Autonomic Nervous System 5 ) Dr : (Mohamed Talal) Date: / 10 / 2024 rasympathetic nervous system ect on thorax and abdomen : vagus nerve : ( 10th cranial nerve ) origin : vagal nucleus in medulla relay : terminal ganglia Action :...
Field of Medicine Medicine Program Lecture : (Autonomic Nervous System 5 ) Dr : (Mohamed Talal) Date: / 10 / 2024 rasympathetic nervous system ect on thorax and abdomen : vagus nerve : ( 10th cranial nerve ) origin : vagal nucleus in medulla relay : terminal ganglia Action : on Thorax Heart -ve inotropic effect -ve chronotropic effect decrease coronary blood flow and O2 consumption Lung bronchial constriction vasodilatation of pulmonary blood vessels rasympathetic nervous system ect on thorax and abdomen : vagus nerve : ( 10th cranial nerve ) Action : on abdomen GIT : motor to the wall inhibitory to sphincters gall bladder : ( evacuation ) motor to the wall inhibitory to sphincter of oddi rasympathetic nervous system ffect on pelvis : Origin: S2, 3, 4 Course: pelvic nerve Relay: terminal ganglia On the rectum : (defecation ) contraction of wall inhibition of internal anal sphincter rasympathetic nervous system ffect on pelvis : on the urinary bladder : ( micturition ) contraction of wall inhibition of internal urethral sphincter On male genitalia : erection urotransmitters of parasympathetic nervous system Chemical neurotransmitters : Acetylcholine urotransmitters of autonomic nervous system rasympathetic nervous system: Acetyl choline : Formation: Acetate + Co-enzyme A Acetyl Co-A + choline Acetyl choline rasympathetic nervous system: Acetyl choline : Removal: By choline esterase enzyme rasympathetic nervous system: Nicotinic receptors : Site : Autonomic ganglia Stimulated by : Nicotine small dose – anti- choline esterase Blocked by : Nicotine large dose – hexamethonium – tetraethyl ammonium rasympathetic nervous system: muscarinic receptors : Site : the effector organ Stimulated by : Muscarine – pilocarpine – anti-choline esterase Blocked by : Atropine – homatropine Types : M 1 , M 2, M 3 , M 4 and M 5 ( in CNS )
